Fix Surah seed tracking conflict on API startup retries.

Use idempotent seed, fresh DbContext per retry, and explicit Surah/Tafsir keys.

src/TafsirQuran.Api/Program.cs

@@ -40,14 +40,15 @@ builder.Services.AddOpenApi();
 
 var app = builder.Build();
 
-using (var scope = app.Services.CreateScope())
 {
-    var db = scope.ServiceProvider.GetRequiredService<AppDbContext>();
+    var audioRoot = app.Configuration["AudioRoot"] ?? "/data/audio";
     for (var attempt = 1; ; attempt++)
     {
         try
         {
-            var audioRoot = app.Configuration["AudioRoot"] ?? "/data/audio";
+            // Fresh scope each attempt so a failed seed cannot leave tracked entities.
+            using var scope = app.Services.CreateScope();
+            var db = scope.ServiceProvider.GetRequiredService<AppDbContext>();
             await DbSeeder.SeedAsync(db, audioRoot);
             break;
         }