feat: Implement staff availability feature with BLoC architecture

- Created AvailabilityPage with UI for managing staff availability.
- Integrated BLoC for state management, including LoadAvailability and ToggleDayStatus events.
- Added quick set options for availability (All Week, Weekdays, Weekends, Clear All).
- Implemented week navigation and day selection with visual feedback.
- Developed time slot management for each day, allowing toggling of availability.
- Established StaffAvailabilityModule for dependency injection and routing.
- Updated pubspec.yaml with necessary dependencies for the feature.

apps/mobile/packages/features/staff/availability/pubspec.yaml

@@ -0,0 +1,35 @@
+name: staff_availability
+description: Staff Availability Feature
+version: 0.0.1
+publish_to: 'none'
+resolution: workspace
+
+environment:
+  sdk: '>=3.0.0 <4.0.0'
+  flutter: ">=1.17.0"
+
+dependencies:
+  flutter:
+    sdk: flutter
+  flutter_bloc: ^8.1.3
+  equatable: ^2.0.5
+  intl: ^0.20.0
+  lucide_icons: ^0.257.0
+  flutter_modular: ^6.3.2
+  
+  # Internal packages
+  core_localization:
+    path: ../../../core_localization
+  design_system:
+    path: ../../../design_system
+  krow_domain:
+    path: ../../../domain
+  krow_data_connect:
+    path: ../../../data_connect
+  krow_core:
+    path: ../../../core
+
+dev_dependencies:
+  flutter_test:
+    sdk: flutter
+  flutter_lints: ^3.0.0