fix(email): resolve SMTP authentication failure and improve configuration resilience

- Fixed a bug where missing 'id=0' in the 'cfg' table caused SMTP authentication to fail by defaulting to placeholder credentials.
- Updated 'app/lib_email.py' to explicitly validate SMTP server and port settings before connecting, preventing crashes with 'please run connect() first'.
- Added email fallback logic in 'app/methods/person_methods.py' to use 'user_email' or 'primary_email' if the primary contact email is missing.
- Aligned 'app/config.py.default' with the production structure, explicitly re-adding 'SMTP' and 'FILES_PATH' dictionaries.
- Added comprehensive unit tests in 'tests/test_email_configuration.py' to verify configuration handling.

tests/verify_email_safe.py

@@ -0,0 +1,67 @@
+import sys
+import os
+import logging
+import unittest
+from unittest.mock import MagicMock, patch
+
+# Add current directory to path
+sys.path.append(os.getcwd())
+
+# Mock html2text before importing app.lib_email
+sys.modules['html2text'] = MagicMock()
+
+# Configure logging
+logging.basicConfig(level=logging.DEBUG)
+
+from app.lib_email import send_email
+from app.config import settings
+
+class TestEmail(unittest.TestCase):
+    def test_send_email_missing_settings(self):
+        print("\nTesting send_email with missing SMTP settings...")
+        # Backup original settings
+        original_smtp = getattr(settings, 'SMTP', {})
+        
+        # Clear settings
+        settings.SMTP = {}
+        
+        result = send_email(
+            from_email="test@example.com",
+            to_email="test@example.com",
+            subject="Test Email",
+            body_html="<p>Test</p>",
+            test=True
+        )
+        
+        # Restore settings
+        settings.SMTP = original_smtp
+        
+        print(f"Result (should be False): {result}")
+        self.assertFalse(result)
+
+    def test_send_email_invalid_port(self):
+        print("\nTesting send_email with invalid port...")
+        original_smtp = getattr(settings, 'SMTP', {})
+        
+        settings.SMTP = {
+            'server': 'smtp.example.com',
+            'port': 'invalid',
+            'username': 'user',
+            'password': 'pass'
+        }
+        
+        result = send_email(
+            from_email="test@example.com",
+            to_email="test@example.com",
+            subject="Test Email",
+            body_html="<p>Test</p>",
+            test=True
+        )
+        
+        settings.SMTP = original_smtp
+        
+        print(f"Result (should be False): {result}")
+        self.assertFalse(result)
+
+if __name__ == "__main__":
+    unittest.main()