chore: standardize security and quality foundations

backend/app/routers/portal.py

@@ -11,6 +11,7 @@ import httpx
 from fastapi import APIRouter, Depends, HTTPException, Query
 
 from ..auth import get_current_user
+from ..api_models import COMMON_ERROR_RESPONSES
 from ..clients.jellyfin import JellyfinClient
 from ..db import (
     add_portal_item_activity,
@@ -34,7 +35,12 @@ from ..services.issue_resolution import (
 from ..services.notifications import send_portal_notification
 from ..runtime import get_runtime_settings
 
-router = APIRouter(prefix="/portal", tags=["portal"], dependencies=[Depends(get_current_user), Depends(require_portal_access)])
+router = APIRouter(
+    prefix="/portal",
+    tags=["portal"],
+    dependencies=[Depends(get_current_user), Depends(require_portal_access)],
+    responses=COMMON_ERROR_RESPONSES,
+)
 logger = logging.getLogger(__name__)
 
 PORTAL_KINDS = {"request", "issue", "feature"}