feat(root): add run_app and run_lock helper functions

Introduce helper functions to invoke the primary application and lock entry points, enhancing modularity and testability.

New Features
- run_app(): launches the main application.
- run_lock(): launches the lock module.

Enhancements
- Refactor start.py to isolate command execution logic.

start.py

@@ -7,13 +7,16 @@ src_path = os.path.join(os.path.dirname(__file__), "src")
 if src_path not in sys.path:
     sys.path.insert(0, src_path)
 
+
 def run_app():
     from main import main as app_main
+
     app_main()
 
 
 def run_lock():
     from lock import main as lock_main
+
     lock_main()