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

zoho_client.py

@@ -33,15 +33,15 @@ class ZohoClient:
             print("💡 Make sure IMAP is enabled in your Zoho Mail settings")
             raise
     
-    def fetch_emails(self, query: str = None, max_results: int = None) -> List[Dict[str, Any]]:
-        """Fetch emails from Zoho with date filtering (last 7 days)"""
+    def fetch_emails(self, query: str = None, max_results: int = None, days_back: int = 7) -> List[Dict[str, Any]]:
+        """Fetch emails from Zoho with date filtering (configurable days back)"""
         try:
             # Select INBOX
             self.connection.select('INBOX')
             
-            # Build search criteria - only emails from last 7 days
-            seven_days_ago = (datetime.now() - timedelta(days=7)).strftime("%d-%b-%Y")
-            search_criteria = f'SINCE {seven_days_ago}'
+            # Build search criteria - only emails from specified days back
+            days_ago = (datetime.now() - timedelta(days=days_back)).strftime("%d-%b-%Y")
+            search_criteria = f'SINCE {days_ago}'
             
             if query:
                 search_criteria += f' {query}'
@@ -98,7 +98,7 @@ class ZohoClient:
                     print(f"❌ Error processing email {num}: {e}")
                     continue
             
-            print(f"📧 Fetched {len(emails)} real emails from last 7 days")
+            print(f"📧 Fetched {len(emails)} real emails from last {days_back} days")
             return emails
             
         except Exception as e: