feat(tpos): add BFF data endpoints with Npgsql + Dapper

- Add Npgsql 9.0.3 and Dapper 2.1.66 packages to Server project
- Create BffDataController with read-only endpoints:
  GET /api/bff/shops
  GET /api/bff/shops/{shopId}/products
  GET /api/bff/shops/{shopId}/categories
  GET /api/bff/shops/{shopId}/tables
  GET /api/bff/shops/{shopId}/appointments
  GET /api/bff/shops/{shopId}/resources
- Register MVC controllers in Program.cs (AddControllers + MapControllers)

Co-authored-by: Velik <hongochai10@users.noreply.github.com>

apps/web-client-tpos-net/src/WebClientTpos.Server/Program.cs

@@ -41,6 +41,10 @@ builder.Services.AddCors(options =>
 // VI: Thêm health checks
 builder.Services.AddHealthChecks();
 
+// EN: Add MVC controllers for BFF data endpoints
+// VI: Thêm MVC controllers cho BFF data endpoints
+builder.Services.AddControllers();
+
 var app = builder.Build();
 
 // ═══════════════════════════════════════════════════════════════════════════════
@@ -116,6 +120,10 @@ app.Map("{culture:regex(^(en-US|vi-VN)$)}/{**slug}", async (string culture, Http
     return Results.Content(modifiedHtml, "text/html");
 });
 
+// EN: Map BFF API controllers
+// VI: Map BFF API controllers
+app.MapControllers();
+
 // EN: Fallback to index.html for SPA routing (default culture)
 // VI: Fallback đến index.html cho SPA routing (ngôn ngữ mặc định)
 app.MapFallbackToFile("index.html");