feat: Enhance Python environment setup with system Python option and improve dependency installation

refactor: Clean up imports in currencies and users routes
fix: Update theme settings saving logic and clean up test imports

scripts/seed_data.py

@@ -16,8 +16,7 @@ from __future__ import annotations
 
 import argparse
 import logging
-import os
-from typing import Iterable, Optional
+from typing import Optional
 
 import psycopg2
 from psycopg2 import errors