Add additional services system (v0.5.0)

- Service CPT with pricing types: Included, Per Booking, Per Night
- ServiceCategory taxonomy with default categories
- Booking-services integration with service selector
- Real-time price calculation based on nights and quantity
- Services total and grand total display in booking admin

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CLAUDE.md

@@ -502,3 +502,61 @@ Admin features always work; frontend requires valid license.
 - Merged to main (fast-forward)
 - Tagged: `v0.3.0`
 - Pushed to origin: dev, main, v0.3.0
+
+### 2026-01-31 - Version 0.5.0 (Additional Services)
+
+**Completed:**
+
+- Created Custom Taxonomy: Service Categories (`bnb_service_category`)
+  - Non-hierarchical (tag-like) structure
+  - Dashicon selection for visual display
+  - Sort order meta field for custom ordering
+  - Default categories: Food & Dining, Transportation, Wellness & Spa, Activities, Housekeeping
+- Created Custom Post Type: Services (`bnb_service`)
+  - Three pricing types: Included (free), Per Booking, Per Night
+  - Price configuration per service
+  - Service status (active/inactive)
+  - Sort order for display ordering
+  - Maximum quantity setting per service
+  - Custom admin columns: pricing type, price, status
+  - Filters by status and pricing type
+  - Helper methods: `get_service_data()`, `calculate_service_price()`, `get_services_for_booking()`, `format_service_price()`
+- Updated Booking post type with services integration
+  - Added `SERVICES_META_KEY` constant for services storage
+  - New meta box: Additional Services with checkbox selection
+  - Quantity input for services with max_quantity > 1
+  - Real-time per-service line total calculation
+  - Services total display
+  - Price breakdown now shows services cost
+  - Grand total (room + services) in pricing meta box
+  - Admin list price column shows total including services
+  - Helper methods: `calculate_booking_services_total()`, `get_booking_services()`
+- Updated `src/Plugin.php`
+  - Registered ServiceCategory taxonomy
+  - Registered Service post type
+  - Added Service post type to asset enqueuing
+  - Added i18n strings for service pricing descriptions
+- Updated `assets/css/admin.css`
+  - Service status badges
+  - Service pricing meta box styles
+  - Booking services selector styles
+  - Service item with selected state
+  - Quantity inputs and line totals
+  - Services total summary
+  - Grand total display
+- Updated `assets/js/admin.js`
+  - `initServicePricing()`: Toggle price row based on pricing type
+  - `initBookingServices()`: Service selection with real-time price calculation
+  - Quantity change handlers with min/max enforcement
+  - Automatic recalculation when booking dates change
+- Updated version to 0.5.0
+- Updated CHANGELOG.md with Phase 5 changes
+- Updated PLAN.md to mark Phase 5 complete
+
+**Learnings:**
+
+- Service pricing calculation depends on pricing_type: included=0, per_booking=price*qty, per_night=price*qty*nights
+- Services are stored as JSON array in booking meta with service_id, quantity, price, pricing_type
+- Same namespace classes can reference each other directly without use statements
+- Services meta box renders before pricing meta box so services total is available
+- Grand total calculation happens both on save (server-side) and on change (client-side JS)