Refactor code for improved readability and consistency

- Cleaned up whitespace and formatting in various files including http.py, language.py, logger.py, safe_exec.py, and SQL migration scripts.
- Consolidated import statements and removed unnecessary blank lines.
- Updated logging configuration for better clarity.
- Enhanced the safe execution code with improved error handling and logging.
- Removed commented-out code and unnecessary variables in backfill_zero_trades.py and other scripts.
- Added a pyproject.toml for Ruff and Vulture configuration.
- Introduced requirements-dev.txt for development dependencies.
- Removed commented-out stock entries in init.sql for cleaner migration scripts.

backend_api_python/app/services/exchange_execution.py

@@ -13,9 +13,9 @@ from __future__ import annotations
 import json
 from typing import Any, Dict
 
+from app.utils.credential_crypto import decrypt_credential_blob
 from app.utils.db import get_db_connection
 from app.utils.logger import get_logger
-from app.utils.credential_crypto import decrypt_credential_blob
 
 logger = get_logger(__name__)
 
@@ -145,5 +145,3 @@ def resolve_exchange_config(exchange_config: Dict[str, Any], user_id: int = 1) -
         merged[k] = v
 
     return merged
-
-