feat(AppVersion): Add version tracking system for frontend cache invalidation

- Add AppVersion entity with CurrentVersion, MinRequiredVersion, RequiresFullCacheClear
- Add GetAppVersion query to check app version and compare with client version
- Add GetAllAppVersions query for admin panel
- Add UpdateAppVersion command to update/create app versions
- Add appversion.proto for gRPC communication
- Add AppVersionService for gRPC endpoints
- Add database migration for AppVersions table

src/CMSMicroservice.Application/AppVersionCQ/Queries/GetAppVersion/GetAppVersionQueryHandler.cs

@@ -0,0 +1,75 @@
+using CMSMicroservice.Domain.Entities.Configuration;
+
+namespace CMSMicroservice.Application.AppVersionCQ.Queries.GetAppVersion;
+
+/// <summary>
+/// Handler برای دریافت آخرین نسخه اپلیکیشن
+/// </summary>
+public class GetAppVersionQueryHandler : IRequestHandler<GetAppVersionQuery, AppVersionDto?>
+{
+    private readonly IApplicationDbContext _context;
+
+    public GetAppVersionQueryHandler(IApplicationDbContext context)
+    {
+        _context = context;
+    }
+
+    public async Task<AppVersionDto?> Handle(GetAppVersionQuery request, CancellationToken cancellationToken)
+    {
+        var appVersion = await _context.AppVersions
+            .Where(v => v.AppName == request.AppName && v.IsActive && !v.IsDeleted)
+            .FirstOrDefaultAsync(cancellationToken);
+
+        if (appVersion == null)
+        {
+            return new AppVersionDto
+            {
+                Found = false,
+                AppName = request.AppName
+            };
+        }
+
+        // مقایسه ورژن کلاینت با حداقل نسخه مورد نیاز
+        bool requiresUpdate = false;
+        if (!string.IsNullOrEmpty(request.CurrentClientVersion) && !string.IsNullOrEmpty(appVersion.MinRequiredVersion))
+        {
+            requiresUpdate = CompareVersions(request.CurrentClientVersion, appVersion.MinRequiredVersion) < 0;
+        }
+
+        return new AppVersionDto
+        {
+            Found = true,
+            AppName = appVersion.AppName,
+            CurrentVersion = appVersion.CurrentVersion,
+            MinRequiredVersion = appVersion.MinRequiredVersion,
+            RequiresFullCacheClear = appVersion.RequiresFullCacheClear,
+            RequiresUpdate = requiresUpdate,
+            UpdateMessage = appVersion.UpdateMessage,
+            ReleaseNotes = appVersion.ReleaseNotes,
+            LastUpdated = appVersion.LastModified ?? appVersion.Created
+        };
+    }
+
+    /// <summary>
+    /// مقایسه دو نسخه (مثلاً 1.2.3 با 1.3.0)
+    /// برگشت: منفی = اولی کوچکتر، مثبت = اولی بزرگتر، صفر = برابر
+    /// </summary>
+    private static int CompareVersions(string version1, string version2)
+    {
+        var v1Parts = version1.Split('.').Select(s => int.TryParse(s, out var n) ? n : 0).ToArray();
+        var v2Parts = version2.Split('.').Select(s => int.TryParse(s, out var n) ? n : 0).ToArray();
+
+        var maxLen = Math.Max(v1Parts.Length, v2Parts.Length);
+        
+        for (int i = 0; i < maxLen; i++)
+        {
+            var v1 = i < v1Parts.Length ? v1Parts[i] : 0;
+            var v2 = i < v2Parts.Length ? v2Parts[i] : 0;
+            
+            if (v1 != v2)
+                return v1.CompareTo(v2);
+        }
+
+        return 0;
+    }
+}