fix: resolve FE-003 and AUTH-004 architecture violations

- Use error_state macro in vendor dashboard instead of inline HTML
- Add # authenticated marker to shop profile/addresses endpoints

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/api/v1/shop/addresses.py

@@ -28,7 +28,7 @@ router = APIRouter()
 logger = logging.getLogger(__name__)
 
 
-@router.get("/addresses", response_model=CustomerAddressListResponse)
+@router.get("/addresses", response_model=CustomerAddressListResponse)  # authenticated
 def list_addresses(
     request: Request,
     customer: Customer = Depends(get_current_customer_api),

app/api/v1/shop/profile.py

@@ -30,7 +30,7 @@ router = APIRouter()
 logger = logging.getLogger(__name__)
 
 
-@router.get("/profile", response_model=CustomerResponse)
+@router.get("/profile", response_model=CustomerResponse)  # authenticated
 def get_profile(
     customer: Customer = Depends(get_current_customer_api),
     db: Session = Depends(get_db),