Refactor: Auth & Identity System v1.4

- Fix: Resolved SQLAlchemy Mapper error for 'UserVehicle' using string-based relationships.
- Fix: Fixed Postgres Enum case sensitivity issue for 'userrole' (forcing lowercase 'user').
- Fix: Resolved ImportError for 'create_access_token' in security module.
- Feature: Implemented 2-step registration protocol (Lite Register -> KYC Step).
- Data: Added bank-level KYC fields (mother's name, ID/Driver/Boat/Pilot license expiry and categories).
- Business: Applied private fleet isolation (is_transferable=False for individual orgs).
- Docs: Updated Grand Master Book to v1.4 and added Developer Pitfalls guide.

backend/app/api/v1/api.py

@@ -1,11 +1,5 @@
 from fastapi import APIRouter
-from app.api.v1.endpoints import auth # Fontos a helyes import!
+from app.api.v1.endpoints import auth
 
 api_router = APIRouter()
-
-# Minden auth funkciót ide gyűjtünk (Register, Login, Recover)
-api_router.include_router(auth.router, prefix="/auth", tags=["Authentication"])
-
-# Itt jönnek majd a további modulok:
-# api_router.include_router(users.router, prefix="/users", tags=["Users"])
-# api_router.include_router(fleet.router, prefix="/fleet", tags=["Fleet"])
+api_router.include_router(auth.router, prefix="/auth", tags=["Authentication"])