feat: add file management entities and services for chat message handling

ServiceHost/Program.cs

@@ -492,6 +492,24 @@ app.UseHttpsRedirection();
 
 app.UseStaticFiles();
 
+// Static files برای فایل‌های آپلود شده
+var uploadsPath = builder.Configuration["FileStorage:LocalPath"] ?? Path.Combine(Directory.GetCurrentDirectory(), "Uploads");
+if (!Directory.Exists(uploadsPath))
+{
+    Directory.CreateDirectory(uploadsPath);
+}
+
+app.UseStaticFiles(new StaticFileOptions
+{
+    FileProvider = new Microsoft.Extensions.FileProviders.PhysicalFileProvider(uploadsPath),
+    RequestPath = "/uploads",
+    OnPrepareResponse = ctx =>
+    {
+        // Cache برای فایل‌ها (30 روز)
+        ctx.Context.Response.Headers.Append("Cache-Control", "public,max-age=2592000");
+    }
+});
+
 app.UseCookiePolicy();