docs: add comprehensive code comments, update README and TASKS, create training and troubleshooting guides

- Add JSDoc comments to API routes and business logic functions
- Update README.md with Phase 2 status and deployment/production notes
- Enhance TASKS.md with estimated timelines and dependencies
- Create docs/STAFF_TRAINING.md for team onboarding
- Create docs/CLIENT_ONBOARDING.md for customer experience
- Create docs/OPERATIONAL_PROCEDURES.md for daily operations
- Create docs/TROUBLESHOOTING.md for common setup issues
- Fix TypeScript errors in hq/page.tsx

app/api/bookings/[id]/route.ts

@@ -1,6 +1,9 @@
 import { NextRequest, NextResponse } from 'next/server'
 import { supabaseAdmin } from '@/lib/supabase/client'
 
+/**
+ * @description Updates the status of a specific booking
+ */
 export async function PATCH(
   request: NextRequest,
   { params }: { params: { id: string } }