Chore: Update .gitignore to exclude logs, databases, and venv.

- Added 'Log_from_docker/' to ignore runtime logs.
- Added 'diag_venv/' to ignore temporary diagnostic environments.
- Added '*.db' to exclude local SQLite databases from version control.

.gitignore

@@ -59,8 +59,11 @@ ngrok
 *screenshot.png
 auth_output.txt
 auth_url.txt
-\ngemini_api_key.txt
+gemini_api_key.txt
 .venv/
+diag_venv/
+Log_from_docker/
+*.db
 
 # Node.js specific
 !package.json