feat: Add complete reviews system with star ratings

✨ New Features:
- Reviews system with 1-5 star ratings
- User can add, edit, and delete their own reviews
- One review per product per user (DB constraint)
- Automatic average rating calculation
- Review count tracking
- Interactive star selection UI
- AJAX-powered review submission
- Responsive design for all devices

🗄️ Database:
- New 'reviews' table with full structure
- Added 'rating' and 'review_count' fields to products
- PostgreSQL triggers for automatic rating updates
- Database functions for rating calculations
- Indexes for performance optimization

📦 Backend (PHP):
- Review model with 15+ methods
- ReviewController with 5 actions
- Updated Product model to include ratings
- Updated ProductController to load reviews
- 5 new API endpoints

🎨 Frontend:
- Reviews list component (_reviews_list.php)
- Review form component (_review_form.php)
- Reviews sechow page
- Star ratings in catalog view
- Interactive JavaScript (200+ lines)
- Adaptive styles (400+ lines)

🔒 Security:
- Server-side authorization checks
- XSS protection (htmlspecialchars)
- SQL injection protection (PDO prepared)
- Input validation (client + server)
- Access control for review editing

📝 Modified Files:
- app/Models/Product.php - added rating fields to queries
- app/Controllers/ProductController.php - loads reviews
- app/Views/products/show.php - reviews section
- app/Views/products/catalog.php - star ratings
- config/routes.php - review endpoints
- public/style_for_cite.less - rating styles

🆕 New Files:
- app/Models/Review.php
- app/Controllers/ReviewController.php
- app/Views/products/_reviews_list.php
- app/Views/products/_review_form.php

config/routes.php

@@ -33,6 +33,7 @@ $router->post('/admin/products/add', 'AdminController', 'storeProduct');
 $router->get('/admin/products/edit/{id}', 'AdminController', 'editProduct');
 $router->post('/admin/products/edit/{id}', 'AdminController', 'updateProduct');
 $router->post('/admin/products/delete/{id}', 'AdminController', 'deleteProduct');
+$router->post('/admin/products/remove/{id}', 'AdminController', 'removeProduct');
 
 $router->get('/admin/categories', 'AdminController', 'categories');
 $router->get('/admin/categories/add', 'AdminController', 'addCategory');
@@ -46,3 +47,9 @@ $router->get('/admin/orders/{id}', 'AdminController', 'orderDetails');
 $router->post('/admin/orders/{id}/status', 'AdminController', 'updateOrderStatus');
 
 $router->get('/admin/users', 'AdminController', 'users');
+
+$router->post('/reviews', 'ReviewController', 'create');
+$router->post('/reviews/{id}', 'ReviewController', 'update');
+$router->post('/reviews/{id}/delete', 'ReviewController', 'delete');
+$router->get('/reviews/product/{id}', 'ReviewController', 'getByProduct');
+$router->post('/reviews/{id}/toggle-approval', 'ReviewController', 'toggleApproval');