Fix Zoho connection issues and add local testing capabilities

- Fixed 'days_back' parameter error in zoho_client.py
- Added robust settings validation in app.py to prevent int() errors
- Created LOCAL_TESTING.md with comprehensive testing guide
- Added run_local.sh for easy local server setup
- Added deploy_updates.sh for deployment instructions
- Added test_local_connection.py for automated testing
- Updated config.json with proper structure
- All fixes tested and working locally

config.json

@@ -20,5 +20,9 @@
   "email_days_back": 7,
   "agency_domains": [
     "projects@manaknightdigital.com"
-  ]
+  ],
+  "zoho_email": "projects@manaknightdigital.com",
+  "zoho_app_password": "4o%!sbk$(3!>@#567!!",
+  "auto_process": false,
+  "auto_process_interval": 30
 }