add price policy

lib/features/price_policy/domain/repositories/price_policy_repository.dart

@@ -0,0 +1,50 @@
+/// Domain Repository Interface: Price Policy Repository
+///
+/// Defines the contract for price policy document data operations.
+/// This is an abstract interface following the Repository Pattern.
+///
+/// The actual implementation will be in the data layer.
+/// This allows for dependency inversion and easier testing.
+library;
+
+import 'package:worker/features/price_policy/domain/entities/price_document.dart';
+
+/// Price Policy Repository Interface
+///
+/// Provides methods to:
+/// - Get all price policy documents
+/// - Filter documents by category
+/// - Fetch individual document details
+///
+/// Implementation will be in data/repositories/price_policy_repository_impl.dart
+abstract class PricePolicyRepository {
+  /// Get all price policy documents
+  ///
+  /// Returns list of [PriceDocument] objects.
+  /// Returns empty list if no documents available.
+  ///
+  /// This should fetch from local cache first, then sync with server.
+  /// Documents should be ordered by published date (newest first).
+  Future<List<PriceDocument>> getAllDocuments();
+
+  /// Get documents filtered by category
+  ///
+  /// Returns list of [PriceDocument] objects matching the [category].
+  /// Returns empty list if no matching documents.
+  ///
+  /// [category] - The category to filter by (policy or priceList)
+  Future<List<PriceDocument>> getDocumentsByCategory(DocumentCategory category);
+
+  /// Get a specific document by ID
+  ///
+  /// Returns [PriceDocument] if found, null otherwise.
+  ///
+  /// [documentId] - The unique identifier of the document
+  Future<PriceDocument?> getDocumentById(String documentId);
+
+  /// Refresh documents from server
+  ///
+  /// Force refresh documents from remote source.
+  /// Updates local cache after successful fetch.
+  Future<List<PriceDocument>> refreshDocuments();
+}