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>

scripts/test_linkedin_setup.py

@@ -0,0 +1,131 @@
+#!/usr/bin/env python3
+"""
+Test script to verify LinkedIn auto-posting setup.
+
+Usage:
+    python scripts/test_linkedin_setup.py
+"""
+import asyncio
+import sys
+from pathlib import Path
+
+# Add project root to path
+sys.path.insert(0, str(Path(__file__).parent.parent))
+
+from src.config import settings
+from src.database.client import db
+
+
+async def main():
+    """Run setup checks."""
+    print("=" * 70)
+    print("LinkedIn Auto-Posting Setup Verification")
+    print("=" * 70)
+    print()
+
+    checks_passed = 0
+    checks_total = 0
+
+    # Check 1: Environment variables
+    print("📋 Checking environment variables...")
+    checks_total += 4
+
+    if settings.linkedin_client_id:
+        print("  ✅ LINKEDIN_CLIENT_ID is set")
+        checks_passed += 1
+    else:
+        print("  ❌ LINKEDIN_CLIENT_ID is missing")
+
+    if settings.linkedin_client_secret:
+        print("  ✅ LINKEDIN_CLIENT_SECRET is set")
+        checks_passed += 1
+    else:
+        print("  ❌ LINKEDIN_CLIENT_SECRET is missing")
+
+    if settings.linkedin_redirect_uri:
+        print("  ✅ LINKEDIN_REDIRECT_URI is set")
+        checks_passed += 1
+        print(f"     URI: {settings.linkedin_redirect_uri}")
+    else:
+        print("  ❌ LINKEDIN_REDIRECT_URI is missing")
+
+    if settings.encryption_key:
+        print("  ✅ ENCRYPTION_KEY is set")
+        checks_passed += 1
+    else:
+        print("  ❌ ENCRYPTION_KEY is missing")
+
+    print()
+
+    # Check 2: Encryption
+    print("🔐 Testing encryption...")
+    checks_total += 1
+
+    try:
+        from src.utils.encryption import encrypt_token, decrypt_token
+        test_token = "test_access_token_12345"
+        encrypted = encrypt_token(test_token)
+        decrypted = decrypt_token(encrypted)
+
+        if decrypted == test_token:
+            print("  ✅ Encryption/decryption working")
+            checks_passed += 1
+        else:
+            print("  ❌ Encryption/decryption mismatch")
+    except Exception as e:
+        print(f"  ❌ Encryption error: {e}")
+
+    print()
+
+    # Check 3: Database table
+    print("💾 Checking database schema...")
+    checks_total += 1
+
+    try:
+        # Try to query the table (will fail if it doesn't exist)
+        result = await asyncio.to_thread(
+            lambda: db.client.table("linkedin_accounts").select("id").limit(0).execute()
+        )
+        print("  ✅ linkedin_accounts table exists")
+        checks_passed += 1
+    except Exception as e:
+        print(f"  ❌ linkedin_accounts table not found: {e}")
+        print("     Run: psql $DATABASE_URL -f config/migrate_add_linkedin_accounts.sql")
+
+    print()
+
+    # Check 4: LinkedIn service
+    print("🔧 Checking LinkedIn service...")
+    checks_total += 1
+
+    try:
+        from src.services.linkedin_service import linkedin_service
+        print("  ✅ LinkedIn service initialized")
+        checks_passed += 1
+    except Exception as e:
+        print(f"  ❌ LinkedIn service error: {e}")
+
+    print()
+
+    # Summary
+    print("=" * 70)
+    print(f"Summary: {checks_passed}/{checks_total} checks passed")
+    print("=" * 70)
+
+    if checks_passed == checks_total:
+        print("✅ All checks passed! LinkedIn auto-posting is ready.")
+        print("\nNext steps:")
+        print("1. Restart your application")
+        print("2. Log in as an employee")
+        print("3. Go to Settings and connect your LinkedIn account")
+        print("4. Schedule a test post")
+        return 0
+    else:
+        print("❌ Some checks failed. Please fix the issues above.")
+        print("\nSetup guide: See LINKEDIN_SETUP.md for detailed instructions")
+        return 1
+
+
+if __name__ == "__main__":
+    exit_code = asyncio.run(main())
+    sys.exit(exit_code)