feat: Implement available orders feature in staff marketplace

- Added `AvailableOrder` and `AvailableOrderSchedule` entities to represent available orders and their schedules.
- Introduced `GetAvailableOrdersUseCase` and `BookOrderUseCase` for fetching and booking orders.
- Created `AvailableOrdersBloc` to manage the state of available orders and handle booking actions.
- Developed UI components including `AvailableOrderCard` to display order details and booking options.
- Added necessary events and states for the BLoC architecture to support loading and booking orders.
- Integrated new enums and utility functions for handling order types and scheduling.

apps/mobile/packages/core/lib/src/services/api_service/endpoints/client_endpoints.dart

@@ -92,7 +92,7 @@ abstract final class ClientEndpoints {
 
   /// View orders.
   static const ApiEndpoint ordersView =
-      ApiEndpoint('/client/orders/view');
+      ApiEndpoint('/client/shifts/scheduled');
 
   /// Order reorder preview.
   static ApiEndpoint orderReorderPreview(String orderId) =>

apps/mobile/packages/core/lib/src/services/api_service/endpoints/staff_endpoints.dart

@@ -130,6 +130,10 @@ abstract final class StaffEndpoints {
   /// FAQs search.
   static const ApiEndpoint faqsSearch = ApiEndpoint('/staff/faqs/search');
 
+  /// Available orders for the marketplace.
+  static const ApiEndpoint ordersAvailable =
+      ApiEndpoint('/staff/orders/available');
+
   // ── Write ─────────────────────────────────────────────────────────────
 
   /// Staff profile setup.
@@ -198,6 +202,10 @@ abstract final class StaffEndpoints {
   static const ApiEndpoint locationStreams =
       ApiEndpoint('/staff/location-streams');
 
+  /// Book an available order.
+  static ApiEndpoint orderBook(String orderId) =>
+      ApiEndpoint('/staff/orders/$orderId/book');
+
   /// Register or delete device push token (POST to register, DELETE to remove).
   static const ApiEndpoint devicesPushTokens =
       ApiEndpoint('/staff/devices/push-tokens');