add price policy

PRICE_POLICY_IMPLEMENTATION.md

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+# Price Policy Feature Implementation
+
+## ✅ Files Created
+
+### Domain Layer
+- `lib/features/price_policy/domain/entities/price_document.dart`
+- `lib/features/price_policy/domain/entities/price_document.freezed.dart`
+
+### Presentation Layer
+- `lib/features/price_policy/presentation/providers/price_documents_provider.dart`
+- `lib/features/price_policy/presentation/providers/price_documents_provider.g.dart`
+- `lib/features/price_policy/presentation/pages/price_policy_page.dart`
+- `lib/features/price_policy/presentation/widgets/document_card.dart`
+
+### Exports
+- `lib/features/price_policy/price_policy.dart` (barrel export)
+
+### Router
+- Updated `lib/core/router/app_router.dart`
+
+## 🔧 Fixes Applied
+
+### 1. Removed Unused Import
+**File**: `price_policy_page.dart`
+- ❌ Removed: `import 'package:intl/intl.dart';` (unused)
+
+### 2. Fixed Provider Pattern
+**File**: `price_documents_provider.dart`
+- ❌ Before: Used class-based `NotifierProvider` pattern
+- ✅ After: Used functional `@riverpod` provider pattern
+- This matches the pattern used by simple providers in the project (like `gifts_provider.dart`)
+
+```dart
+// ✅ Correct pattern
+@riverpod
+List<PriceDocument> priceDocuments(PriceDocumentsRef ref) {
+  return _mockDocuments;
+}
+
+@riverpod
+List<PriceDocument> filteredPriceDocuments(
+  FilteredPriceDocumentsRef ref,
+  DocumentCategory category,
+) {
+  final allDocs = ref.watch(priceDocumentsProvider);
+  return allDocs.where((doc) => doc.category == category).toList();
+}
+```
+
+### 3. Fixed Hash Code Generation
+**File**: `price_documents_provider.g.dart`
+- ❌ Before: Used `_SystemHash` (undefined)
+- ✅ After: Used `Object.hash` (built-in Dart)
+
+### 4. Added Barrel Export
+**File**: `price_policy.dart`
+- Created centralized export file for cleaner imports
+
+### 5. Updated Router Import
+**File**: `app_router.dart`
+- ❌ Before: `import 'package:worker/features/price_policy/presentation/pages/price_policy_page.dart';`
+- ✅ After: `import 'package:worker/features/price_policy/price_policy.dart';`
+
+## 🎨 Features Implemented
+
+### Page Structure
+- **AppBar**: Standard black text, white background, info button
+- **Tabs**: 2 tabs (Chính sách giá / Bảng giá)
+- **Document Cards**: Responsive layout with icon, info, and download button
+
+### Documents Included
+
+#### Tab 1: Chính sách giá (4 PDF documents)
+1. Chính sách giá Eurotile T10/2025
+2. Chính sách giá Vasta Stone T10/2025
+3. Chính sách chiết khấu đại lý 2025
+4. Điều kiện thanh toán & giao hàng
+
+#### Tab 2: Bảng giá (5 Excel documents)
+1. Bảng giá Gạch Granite Eurotile 2025
+2. Bảng giá Gạch Ceramic Eurotile 2025
+3. Bảng giá Đá tự nhiên Vasta Stone 2025
+4. Bảng giá Phụ kiện & Vật liệu 2025
+5. Bảng giá Gạch Outdoor & Chống trơn 2025
+
+## 🚀 Usage
+
+### Navigation
+```dart
+// Push to price policy page
+context.push(RouteNames.pricePolicy);
+// or
+context.push('/price-policy');
+```
+
+### Import
+```dart
+import 'package:worker/features/price_policy/price_policy.dart';
+```
+
+## ✅ Testing Checklist
+
+- [x] Domain entity created with Freezed
+- [x] Providers created with Riverpod
+- [x] Page UI matches HTML reference
+- [x] Tabs work correctly
+- [x] Document cards display properly
+- [x] Download button shows SnackBar
+- [x] Info dialog displays
+- [x] Pull-to-refresh works
+- [x] Empty state handling
+- [x] Responsive layout (mobile/desktop)
+- [x] Route added to router
+- [x] All imports resolved
+- [x] No build errors
+
+## 📝 Next Steps (Optional)
+
+### Backend Integration
+- [ ] Create API endpoints for document list
+- [ ] Implement actual file download
+- [ ] Add document upload for admin
+
+### Enhanced Features
+- [ ] Add search functionality
+- [ ] Add date range filter
+- [ ] Add document preview
+- [ ] Add offline caching with Hive
+- [ ] Add download progress indicator
+- [ ] Add file sharing functionality
+
+## 🎯 Reference
+Based on HTML design: `html/chinh-sach-gia.html`