feat: integrate PYMS payment gateway, add blog/sitepage/image services, local file manager

Payment Gateway:
- Add PYMSPaymentService: IPaymentGatewayService via gRPC to PYMS microservice
- Add ZarinPalPaymentService: direct ZarinPal integration (backup)
- Register 'pyms' payment provider in DI ConfigureServices
- Add PYMS proto files (pyms_transaction.proto, pyms_public_messages.proto)
- Fix VerifyDiscountWalletCharge: pass 'OK' as status instead of Authority
- Update appsettings: PaymentProvider=pyms, sandbox mode, merchant ID

Blog System:
- Add BlogCategory, BlogPost, BlogPostImage entities and CQRS
- Add proto files and gRPC services for blog management
- Add Mapster profiles for blog responses

Content Management:
- Add SitePage entity and CQRS for static pages
- Add proto and gRPC service for site pages

Image/File Management:
- Add LocalFileManager with disk storage + base64 serving + FMS fallback
- Add ImagePathResolverInterceptor for gRPC responses
- Add ImageResolverService for explicit image resolution
- Add UploadsController for public file serving with FMS fallback
- Add PaymentCallbackController for discount order payment callbacks

Database:
- Add blog and content entity migrations
- Remove ImagePath MaxLength constraints
- Remove old FileManagementService (replaced by LocalFileManager)

src/CMSMicroservice.Application/DiscountShopCQ/Commands/AddDiscountProductImage/AddDiscountProductImageCommand.cs

@@ -9,4 +9,9 @@ public class AddDiscountProductImageCommand : IRequest<long>
     public string ThumbnailPath { get; set; } = string.Empty;
     public string? Title { get; set; }
     public string? AltText { get; set; }
+
+    // Image file upload
+    public byte[]? ImageFileBytes { get; set; }
+    public string? ImageFileMime { get; set; }
+    public string? ImageFileName { get; set; }
 }

src/CMSMicroservice.Application/DiscountShopCQ/Commands/AddDiscountProductImage/AddDiscountProductImageCommandHandler.cs

@@ -1,3 +1,4 @@
+using CMSMicroservice.Application.Common.FileManager;
 using CMSMicroservice.Application.Common.Interfaces;
 using CMSMicroservice.Domain.Entities.DiscountShop;
 using MediatR;
@@ -8,10 +9,12 @@ namespace CMSMicroservice.Application.DiscountShopCQ.Commands.AddDiscountProduct
 public class AddDiscountProductImageCommandHandler : IRequestHandler<AddDiscountProductImageCommand, long>
 {
     private readonly IApplicationDbContext _context;
+    private readonly IFileManager _fileManager;
 
-    public AddDiscountProductImageCommandHandler(IApplicationDbContext context)
+    public AddDiscountProductImageCommandHandler(IApplicationDbContext context, IFileManager fileManager)
     {
         _context = context;
+        _fileManager = fileManager;
     }
 
     public async Task<long> Handle(AddDiscountProductImageCommand request, CancellationToken cancellationToken)
@@ -23,6 +26,23 @@ public class AddDiscountProductImageCommandHandler : IRequestHandler<AddDiscount
         if (!productExists)
             throw new InvalidOperationException($"DiscountProduct with Id {request.DiscountProductId} not found.");
 
+        var imagePath = request.ImagePath;
+        var thumbnailPath = request.ThumbnailPath;
+
+        // آپلود تصویر (اگر فایل ارسال شده باشد)
+        if (request.ImageFileBytes is { Length: > 0 })
+        {
+            var result = await _fileManager.UploadImageAsync(
+                "Images/DiscountProducts/Gallery",
+                request.ImageFileBytes,
+                request.ImageFileMime ?? "image/jpeg",
+                request.ImageFileName,
+                cancellationToken);
+
+            imagePath = result.Main.Path;
+            thumbnailPath = result.Thumbnail.Path;
+        }
+
         // Get the max sort order for this product
         var maxSortOrder = await _context.DiscountProductImages
             .Where(i => i.DiscountProductId == request.DiscountProductId)
@@ -31,8 +51,8 @@ public class AddDiscountProductImageCommandHandler : IRequestHandler<AddDiscount
         var image = new DiscountProductImage
         {
             DiscountProductId = request.DiscountProductId,
-            ImagePath = request.ImagePath,
-            ThumbnailPath = request.ThumbnailPath,
+            ImagePath = imagePath,
+            ThumbnailPath = thumbnailPath,
             Title = request.Title,
             AltText = request.AltText,
             SortOrder = maxSortOrder + 1,

src/CMSMicroservice.Application/DiscountShopCQ/Commands/CreateDiscountProduct/CreateDiscountProductCommand.cs

@@ -11,5 +11,15 @@ public class CreateDiscountProductCommand : IRequest<long>
     public int MaxDiscountPercent { get; set; }
     public string ImagePath { get; set; }
     public string ThumbnailPath { get; set; }
+    public int SortOrder { get; set; }
+    public bool IsActive { get; set; } = true;
     public List<long> CategoryIds { get; set; } = new();
+
+    // Image file upload
+    public byte[]? ImageFileBytes { get; set; }
+    public string? ImageFileMime { get; set; }
+    public string? ImageFileName { get; set; }
+    public byte[]? ThumbnailFileBytes { get; set; }
+    public string? ThumbnailFileMime { get; set; }
+    public string? ThumbnailFileName { get; set; }
 }

src/CMSMicroservice.Application/DiscountShopCQ/Commands/CreateDiscountProduct/CreateDiscountProductCommandHandler.cs

@@ -1,3 +1,4 @@
+using CMSMicroservice.Application.Common.FileManager;
 using CMSMicroservice.Application.Common.Interfaces;
 using CMSMicroservice.Domain.Entities.DiscountShop;
 using CMSMicroservice.Domain.Enums;
@@ -10,13 +11,16 @@ public class CreateDiscountProductCommandHandler : IRequestHandler<CreateDiscoun
 {
     private readonly IApplicationDbContext _context;
     private readonly IInventoryService _inventoryService;
+    private readonly IFileManager _fileManager;
 
     public CreateDiscountProductCommandHandler(
         IApplicationDbContext context,
-        IInventoryService inventoryService)
+        IInventoryService inventoryService,
+        IFileManager fileManager)
     {
         _context = context;
         _inventoryService = inventoryService;
+        _fileManager = fileManager;
     }
 
     public async Task<long> Handle(CreateDiscountProductCommand request, CancellationToken cancellationToken)
@@ -28,15 +32,42 @@ public class CreateDiscountProductCommandHandler : IRequestHandler<CreateDiscoun
             FullInformation = request.FullInformation,
             Price = request.Price,
             MaxDiscountPercent = request.MaxDiscountPercent,
-            ImagePath = request.ImagePath,
-            ThumbnailPath = request.ThumbnailPath,
-            RemainingCount = 0, // موجودی اولیه صفر - باید از طریق Inventory اضافه شود
+            ImagePath = request.ImagePath ?? string.Empty,
+            ThumbnailPath = request.ThumbnailPath ?? string.Empty,
+            RemainingCount = 0,
             Rate = 0,
             SaleCount = 0,
             ViewCount = 0,
-            IsActive = true
+            IsActive = request.IsActive
         };
 
+        // آپلود تصویر اصلی (اگر فایل ارسال شده باشد)
+        if (request.ImageFileBytes is { Length: > 0 })
+        {
+            var result = await _fileManager.UploadImageAsync(
+                "Images/DiscountProducts",
+                request.ImageFileBytes,
+                request.ImageFileMime ?? "image/jpeg",
+                request.ImageFileName,
+                cancellationToken);
+
+            product.ImagePath = result.Main.Path;
+            product.ThumbnailPath = result.Thumbnail.Path;
+        }
+
+        // آپلود بندانگشتی جداگانه (اختیاری)
+        if (request.ThumbnailFileBytes is { Length: > 0 })
+        {
+            var thumbResult = await _fileManager.UploadAsync(
+                "Images/DiscountProducts/Thumbnails",
+                request.ThumbnailFileBytes,
+                request.ThumbnailFileMime ?? "image/jpeg",
+                request.ThumbnailFileName,
+                cancellationToken);
+
+            product.ThumbnailPath = thumbResult.Path;
+        }
+
         _context.DiscountProducts.Add(product);
         await _context.SaveChangesAsync(cancellationToken);
 

src/CMSMicroservice.Application/DiscountShopCQ/Commands/PlaceOrder/PlaceOrderCommand.cs

@@ -18,4 +18,9 @@ public class PlaceOrderResponseDto
     public long TotalAmount { get; set; }
     public long DiscountBalanceUsed { get; set; }
     public long GatewayAmountRequired { get; set; }
+    
+    /// <summary>
+    /// URL درگاه پرداخت — اگر null باشد یعنی نیاز به پرداخت آنلاین نیست
+    /// </summary>
+    public string? PaymentUrl { get; set; }
 }

src/CMSMicroservice.Application/DiscountShopCQ/Commands/PlaceOrder/PlaceOrderCommandHandler.cs

@@ -5,6 +5,8 @@ using CMSMicroservice.Domain.Entities.Payment;
 using CMSMicroservice.Domain.Enums;
 using MediatR;
 using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Logging;
 
 namespace CMSMicroservice.Application.DiscountShopCQ.Commands.PlaceOrder;
 
@@ -12,13 +14,22 @@ public class PlaceOrderCommandHandler : IRequestHandler<PlaceOrderCommand, Place
 {
     private readonly IApplicationDbContext _context;
     private readonly IInventoryService _inventoryService;
+    private readonly IPaymentGatewayService _paymentGateway;
+    private readonly IConfiguration _configuration;
+    private readonly ILogger<PlaceOrderCommandHandler> _logger;
 
     public PlaceOrderCommandHandler(
         IApplicationDbContext context,
-        IInventoryService inventoryService)
+        IInventoryService inventoryService,
+        IPaymentGatewayService paymentGateway,
+        IConfiguration configuration,
+        ILogger<PlaceOrderCommandHandler> logger)
     {
         _context = context;
         _inventoryService = inventoryService;
+        _paymentGateway = paymentGateway;
+        _configuration = configuration;
+        _logger = logger;
     }
 
     public async Task<PlaceOrderResponseDto> Handle(PlaceOrderCommand request, CancellationToken cancellationToken)
@@ -172,15 +183,102 @@ public class PlaceOrderCommandHandler : IRequestHandler<PlaceOrderCommand, Place
 
         await _context.SaveChangesAsync(cancellationToken);
 
+        // اگر مبلغ درگاه > ۰ باشد، باید به درگاه پرداخت متصل شویم
+        string? paymentUrl = null;
+
+        if (finalGatewayAmount > 0)
+        {
+            try
+            {
+                // آدرس callback — زرین‌پال بعد از پرداخت کاربر را به اینجا هدایت می‌کند
+                var cmsBaseUrl = _configuration["CmsBaseUrl"] ?? "https://localhost:32846";
+                var callbackUrl = $"{cmsBaseUrl}/api/payment/discount-order/callback?orderId={order.Id}";
+
+                // درخواست به درگاه
+                var paymentResult = await _paymentGateway.InitiatePaymentAsync(new PaymentRequest
+                {
+                    Amount = finalGatewayAmount,
+                    UserId = request.UserId,
+                    Description = $"فروشگاه تخفیفی - سفارش #{order.Id}",
+                    CallbackUrl = callbackUrl
+                }, cancellationToken);
+
+                if (paymentResult.IsSuccess && !string.IsNullOrEmpty(paymentResult.GatewayUrl))
+                {
+                    // ذخیره Authority/RefId در تراکنش برای verify بعدی
+                    transaction.RefId = paymentResult.RefId;
+                    await _context.SaveChangesAsync(cancellationToken);
+
+                    paymentUrl = paymentResult.GatewayUrl;
+                    _logger.LogInformation(
+                        "Payment gateway initiated for DiscountOrder #{OrderId}: RefId={RefId}, Url={Url}",
+                        order.Id, paymentResult.RefId, paymentResult.GatewayUrl);
+                }
+                else
+                {
+                    _logger.LogError(
+                        "Payment gateway initiation failed for DiscountOrder #{OrderId}: {Error}",
+                        order.Id, paymentResult.ErrorMessage);
+
+                    return new PlaceOrderResponseDto
+                    {
+                        Success = false,
+                        Message = $"خطا در اتصال به درگاه پرداخت: {paymentResult.ErrorMessage}",
+                        OrderId = order.Id
+                    };
+                }
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Payment gateway exception for DiscountOrder #{OrderId}", order.Id);
+                return new PlaceOrderResponseDto
+                {
+                    Success = false,
+                    Message = $"خطا در اتصال به درگاه پرداخت: {ex.Message}",
+                    OrderId = order.Id
+                };
+            }
+        }
+        else
+        {
+            // اگر کل مبلغ از کیف تخفیفی پرداخت شد — مستقیماً تکمیل شود
+            transaction.PaymentStatus = PaymentStatus.Success;
+            transaction.PaymentDate = DateTime.Now;
+            order.PaymentStatus = PaymentStatus.Success;
+            order.PaymentDate = DateTime.Now;
+            order.DeliveryStatus = DeliveryStatus.InTransit;
+
+            var walletForDeduct = await _context.UserWallets
+                .FirstOrDefaultAsync(w => w.UserId == request.UserId, cancellationToken);
+            if (walletForDeduct != null)
+                walletForDeduct.DiscountBalance -= actualDiscountBalanceUsed;
+
+            foreach (var cartItem in cartItems)
+            {
+                await _inventoryService.ConfirmSaleAsync(
+                    cartItem.ProductId, ProductType.DiscountProduct,
+                    cartItem.Count, order.Id, cancellationToken);
+                cartItem.Product.SaleCount += cartItem.Count;
+            }
+
+            await _context.SaveChangesAsync(cancellationToken);
+            _logger.LogInformation(
+                "DiscountOrder #{OrderId} fully paid via discount balance ({Amount} T)",
+                order.Id, actualDiscountBalanceUsed);
+        }
+
         return new PlaceOrderResponseDto
         {
             Success = true,
-            Message = "سفارش ایجاد شد. لطفا پرداخت را تکمیل کنید",
+            Message = finalGatewayAmount > 0
+                ? "سفارش ایجاد شد. در حال انتقال به درگاه پرداخت..."
+                : "سفارش با موفقیت ثبت و پرداخت شد",
             OrderId = order.Id,
             TransactionId = transaction.Id,
             TotalAmount = totalAmount,
             DiscountBalanceUsed = actualDiscountBalanceUsed,
-            GatewayAmountRequired = finalGatewayAmount
+            GatewayAmountRequired = finalGatewayAmount,
+            PaymentUrl = paymentUrl
         };
     }
 }

src/CMSMicroservice.Application/DiscountShopCQ/Commands/UpdateDiscountProduct/UpdateDiscountProductCommand.cs

@@ -12,7 +12,16 @@ public class UpdateDiscountProductCommand : IRequest<Unit>
     public int MaxDiscountPercent { get; set; }
     public string ImagePath { get; set; }
     public string ThumbnailPath { get; set; }
+    public int SortOrder { get; set; }
     public int RemainingCount { get; set; }
     public bool IsActive { get; set; }
     public List<long> CategoryIds { get; set; } = new();
+
+    // Image file upload
+    public byte[]? ImageFileBytes { get; set; }
+    public string? ImageFileMime { get; set; }
+    public string? ImageFileName { get; set; }
+    public byte[]? ThumbnailFileBytes { get; set; }
+    public string? ThumbnailFileMime { get; set; }
+    public string? ThumbnailFileName { get; set; }
 }

src/CMSMicroservice.Application/DiscountShopCQ/Commands/UpdateDiscountProduct/UpdateDiscountProductCommandHandler.cs

@@ -1,3 +1,4 @@
+using CMSMicroservice.Application.Common.FileManager;
 using CMSMicroservice.Application.Common.Interfaces;
 using CMSMicroservice.Domain.Entities.DiscountShop;
 using MediatR;
@@ -8,10 +9,12 @@ namespace CMSMicroservice.Application.DiscountShopCQ.Commands.UpdateDiscountProd
 public class UpdateDiscountProductCommandHandler : IRequestHandler<UpdateDiscountProductCommand, Unit>
 {
     private readonly IApplicationDbContext _context;
+    private readonly IFileManager _fileManager;
 
-    public UpdateDiscountProductCommandHandler(IApplicationDbContext context)
+    public UpdateDiscountProductCommandHandler(IApplicationDbContext context, IFileManager fileManager)
     {
         _context = context;
+        _fileManager = fileManager;
     }
 
     public async Task<Unit> Handle(UpdateDiscountProductCommand request, CancellationToken cancellationToken)
@@ -27,11 +30,44 @@ public class UpdateDiscountProductCommandHandler : IRequestHandler<UpdateDiscoun
         product.FullInformation = request.FullInformation;
         product.Price = request.Price;
         product.MaxDiscountPercent = request.MaxDiscountPercent;
-        product.ImagePath = request.ImagePath;
-        product.ThumbnailPath = request.ThumbnailPath;
         product.RemainingCount = request.RemainingCount;
         product.IsActive = request.IsActive;
 
+        // آپلود تصویر اصلی (اگر فایل جدید ارسال شده باشد)
+        if (request.ImageFileBytes is { Length: > 0 })
+        {
+            var result = await _fileManager.UploadImageAsync(
+                "Images/DiscountProducts",
+                request.ImageFileBytes,
+                request.ImageFileMime ?? "image/jpeg",
+                request.ImageFileName,
+                cancellationToken);
+
+            product.ImagePath = result.Main.Path;
+            product.ThumbnailPath = result.Thumbnail.Path;
+        }
+        else if (!string.IsNullOrEmpty(request.ImagePath))
+        {
+            product.ImagePath = request.ImagePath;
+        }
+
+        // آپلود بندانگشتی جداگانه (اختیاری)
+        if (request.ThumbnailFileBytes is { Length: > 0 })
+        {
+            var thumbResult = await _fileManager.UploadAsync(
+                "Images/DiscountProducts/Thumbnails",
+                request.ThumbnailFileBytes,
+                request.ThumbnailFileMime ?? "image/jpeg",
+                request.ThumbnailFileName,
+                cancellationToken);
+
+            product.ThumbnailPath = thumbResult.Path;
+        }
+        else if (!string.IsNullOrEmpty(request.ThumbnailPath))
+        {
+            product.ThumbnailPath = request.ThumbnailPath;
+        }
+
         // Update categories
         var existingCategories = await _context.DiscountProductCategories
             .Where(pc => pc.ProductId == request.ProductId)