Fix config file parsing and improve backup/restore functionality

- Fix external_server.conf parsing to skip comment lines and empty lines
- Update routes.py get_db_connection() to handle comments
- Update settings.py get_external_db_connection() to handle comments
- Improve restore_backup() to use mariadb command instead of Python parsing
- Remove SQLite database creation (MariaDB only)
- Add environment detection for dump command (mariadb-dump vs mysqldump)
- Add conditional SSL flag based on Docker environment
- Fix database restore to handle MariaDB sandbox mode comments

py_app/app/routes.py

@@ -169,8 +169,13 @@ def get_db_connection():
     settings = {}
     with open(settings_file, 'r') as f:
         for line in f:
-            key, value = line.strip().split('=', 1)
-            settings[key] = value
+            line = line.strip()
+            # Skip empty lines and comments
+            if not line or line.startswith('#'):
+                continue
+            if '=' in line:
+                key, value = line.split('=', 1)
+                settings[key] = value
 
     # Create a database connection
     return mariadb.connect(