refactor: configure all route domains using environment variables.

app/Providers/RouteServiceProvider.php

@@ -38,25 +38,28 @@ class RouteServiceProvider extends ServiceProvider
         $this->configureRateLimiting();
 
         $this->routes(function () {
-            // 1. Agency API (Domain riêng, dùng routes/client.php)
-            Route::domain('api-agency.test')
+            // 1. Agency API — domain riêng → chỉ client.php
+            Route::domain(env('API_AGENCY_URL'))
                 ->middleware(['api', 'json.response'])
                 ->namespace($this->namespace)
                 ->group(base_path('routes/client.php'));
 
-            // 2. System API (Dùng cho portal.test/api/..., dùng routes/api.php)
-            Route::prefix('api')
+            // 2. System API — bind về APP_URL
+            Route::domain(env('APP_URL'))
+                ->prefix('api')
                 ->middleware(['api', 'json.response'])
                 ->namespace($this->namespace)
                 ->group(base_path('routes/api.php'));
 
-            // 3. Admin Backend routes (DNS Manager)
-            Route::middleware('web')
+            // 3. Admin Backend routes
+            Route::domain(env('APP_URL'))
+                ->middleware('web')
                 ->namespace($this->namespace)
                 ->group(base_path('routes/admin.php'));
 
             // 4. Web routes
-            Route::middleware('web')
+            Route::domain(env('APP_URL'))
+                ->middleware('web')
                 ->namespace($this->namespace)
                 ->group(base_path('routes/web.php'));
         });