fix: Route priority issue - /order was matched by /{id}

Problem:
POST /payments/gateways/order → 404 'gateway_not_found'

Root Cause:
WordPress REST API matches routes in registration order.
The /gateways/order route was registered AFTER /gateways/{id}.
So /gateways/order was being matched by /gateways/{id} where id='order'.
Then get_gateway('order') returned 'gateway_not_found'.

Solution:
Register specific routes BEFORE dynamic routes:
1. /gateways (list)
2. /gateways/order (specific - NEW POSITION)
3. /gateways/{id} (dynamic)
4. /gateways/{id}/toggle (dynamic with action)

Route Priority Rules:
✅ Specific routes first
✅ Dynamic routes last
✅ More specific before less specific

Before:
/gateways → OK
/gateways/{id} → Matches everything including 'order'
/gateways/{id}/toggle → OK (more specific than {id})
/gateways/order → Never reached!

After:
/gateways → OK
/gateways/order → Matches 'order' specifically
/gateways/{id} → Matches other IDs
/gateways/{id}/toggle → OK

Result:
✅ /gateways/order now works correctly
✅ Sorting saves to database
✅ No more 'gateway_not_found' error

Files Modified:
- PaymentsController.php: Moved /order route before /{id} routes

includes/Api/PaymentsController.php

@@ -42,6 +42,32 @@ class PaymentsController extends WP_REST_Controller {
             'schema' => [$this, 'get_gateways_schema'],
         ]);
         
+        // POST /woonoow/v1/payments/gateways/order
+        // IMPORTANT: Register this BEFORE the dynamic {id} routes to avoid conflicts
+        register_rest_route($this->namespace, '/' . $this->rest_base . '/gateways/order', [
+            [
+                'methods' => WP_REST_Server::EDITABLE,
+                'callback' => [$this, 'save_gateway_order'],
+                'permission_callback' => [$this, 'check_permission'],
+                'args' => [
+                    'category' => [
+                        'description' => 'Gateway category (manual or online)',
+                        'type' => 'string',
+                        'required' => true,
+                        'enum' => ['manual', 'online'],
+                    ],
+                    'order' => [
+                        'description' => 'Array of gateway IDs in desired order',
+                        'type' => 'array',
+                        'required' => true,
+                        'items' => [
+                            'type' => 'string',
+                        ],
+                    ],
+                ],
+            ],
+        ]);
+        
         // GET /woonoow/v1/payments/gateways/{id}
         register_rest_route($this->namespace, '/' . $this->rest_base . '/gateways/(?P<id>[a-zA-Z0-9_-]+)', [
             [
@@ -94,31 +120,6 @@ class PaymentsController extends WP_REST_Controller {
                 ],
             ],
         ]);
-        
-        // POST /woonoow/v1/payments/gateways/order
-        register_rest_route($this->namespace, '/' . $this->rest_base . '/gateways/order', [
-            [
-                'methods' => WP_REST_Server::EDITABLE,
-                'callback' => [$this, 'save_gateway_order'],
-                'permission_callback' => [$this, 'check_permission'],
-                'args' => [
-                    'category' => [
-                        'description' => 'Gateway category (manual or online)',
-                        'type' => 'string',
-                        'required' => true,
-                        'enum' => ['manual', 'online'],
-                    ],
-                    'order' => [
-                        'description' => 'Array of gateway IDs in desired order',
-                        'type' => 'array',
-                        'required' => true,
-                        'items' => [
-                            'type' => 'string',
-                        ],
-                    ],
-                ],
-            ],
-        ]);
     }
     
     /**