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.py

@@ -0,0 +1,29 @@
+import sys
+import os
+import logging
+
+# Add current directory to path
+sys.path.append(os.getcwd())
+
+# Configure logging
+logging.basicConfig(level=logging.DEBUG)
+
+try:
+    from app.lib_email import send_email
+    print("Successfully imported send_email.")
+    
+    print("Running send_email in TEST mode...")
+    result = send_email(
+        from_email="test@example.com",
+        to_email="test@example.com",
+        subject="Test Email",
+        body_html="<p>Test</p>",
+        test=True
+    )
+    
+    print(f"Result: {result}")
+    
+except Exception as e:
+    print(f"Error during email test: {e}")
+    import traceback
+    traceback.print_exc()