fix(backup): log missing db config instead of raising

- Use module logger in backup/db.py
- Skip db dump when no databases.csv entry is present
- Apply black/formatting cleanup across backup/restore/tests

https://chatgpt.com/share/69519d45-b0dc-800f-acb6-6fb8504e9b46

tests/integration/test_seed_integration.py

@@ -6,7 +6,9 @@ import unittest
 from pathlib import Path
 
 
-def run_seed(csv_path: Path, instance: str, database: str, username: str, password: str = "") -> subprocess.CompletedProcess:
+def run_seed(
+    csv_path: Path, instance: str, database: str, username: str, password: str = ""
+) -> subprocess.CompletedProcess:
     # Run the real CLI module (integration-style).
     return subprocess.run(
         [