Refactor contact handling across backend and frontend

Replaced usage of "ContactPerson" with "Contact" for consistency across the codebase. Updated related component props, state variables, API calls, and database queries to align with the new model. Also enhanced backend functionality with stricter validations and added support for handling active pgroups in contact management.

backend/app/routers/protected_router.py

@@ -1,7 +1,12 @@
 from fastapi import APIRouter, Depends
 
 from app.routers.auth import get_current_user
+from app.routers.address import address_router
+from app.routers.contact import contact_router
 
 protected_router = APIRouter(
     dependencies=[Depends(get_current_user)]  # Applies to all routes
 )
+
+protected_router.include_router(address_router, prefix="/addresses", tags=["addresses"])
+protected_router.include_router(contact_router, prefix="/contacts", tags=["contacts"])