Major updates: LinkedIn auto-posting, timezone fixes, and Docker improvements

Features:
- Add LinkedIn OAuth integration and auto-posting functionality
- Add scheduler service for automated post publishing
- Add metadata field to generated_posts for LinkedIn URLs
- Add privacy policy page for LinkedIn API compliance
- Add company management features and employee accounts
- Add license key system for company registrations

Fixes:
- Fix timezone issues (use UTC consistently across app)
- Fix datetime serialization errors in database operations
- Fix scheduling timezone conversion (local time to UTC)
- Fix import errors (get_database -> db)

Infrastructure:
- Update Docker setup to use port 8001 (avoid conflicts)
- Add SSL support with nginx-proxy and Let's Encrypt
- Add LinkedIn setup documentation
- Add migration scripts for schema updates

Services:
- Add linkedin_service.py for LinkedIn API integration
- Add scheduler_service.py for background job processing
- Add storage_service.py for Supabase Storage
- Add email_service.py improvements
- Add encryption utilities for token storage

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

docker-compose.yml

@@ -6,16 +6,17 @@ services:
     container_name: linkedin-posts
     restart: unless-stopped
     ports:
-      - "8000:8000"
+      - "8001:8001"
     env_file:
       - .env
     environment:
       - PYTHONPATH=/app
+      - PORT=8001
     volumes:
       # Optional: Mount logs directory
       - ./logs:/app/logs
     healthcheck:
-      test: ["CMD", "python", "-c", "import httpx; httpx.get('http://localhost:8000/login', timeout=5)"]
+      test: ["CMD", "python", "-c", "import httpx; httpx.get('http://localhost:8001/login', timeout=5)"]
       interval: 30s
       timeout: 10s
       retries: 3