Clean up backup files and consolidate database connection #3729

Originally written by @ccantynz-alt on GitHub.
Imported from https://github.com/ccantynz-alt/Hibiscus-to-airport/pull/18

Summary

This PR removes numerous backup and temporary files that accumulated during development, consolidates the MongoDB connection into a single shared module, and makes minor improvements to environment configuration and component imports.

Key Changes

Cleanup & Organization:

• Removed 100+ backup files (.bak, .bak_* timestamps) from frontend and backend
• Removed temporary test files (backend_test.py, customer_booking_test.py, additional_test.py)
• Removed documentation files that were superseded (BOOKARIDE_COMPLETE_HANDBOOK.md, ADMIN_LOGIN_FIX_GUIDE.md, DEPLOYMENT_STATUS.md, etc.)
• Removed unused Next.js/TypeScript files and agent configuration files
• Cleaned up .gitignore to properly exclude environment files

Database Connection Consolidation:

• Created new backend/db.py module to provide a single shared MongoDB connection instance
• Updated backend/booking_routes.py to import db from the new module instead of creating its own AsyncIOMotorClient
• Removed duplicate MongoDB initialization code from booking_routes.py
• Removed unused motor.motor_asyncio import

Minor Improvements:

• Added format_date_nz to imports in booking_routes.py
• Updated .env.example with clearer environment variable documentation
• Updated frontend/tailwind.config.js with gold and elegant-dark color definitions
• Removed unused AIChatbot component import from BookingPage.jsx
• Updated agent documentation to reflect SMS-only notifications (removed WhatsApp reference)
• Updated sitemap timestamps and various component imports

Implementation Details

The database consolidation follows the singleton pattern—all routes now import the shared db instance from backend/db.py, preventing multiple MongoClient connections and improving resource efficiency. This is a non-breaking change that maintains the same API surface while improving internal architecture.

https://claude.ai/code/session_01PyqnVrkpBzFz9BMiQfPP3t