implemented

backend/routes/meta.py

@@ -0,0 +1,18 @@
+"""Meta endpoints for shared constants."""
+from fastapi import APIRouter
+
+from models import Permission, InviteStatus, ROLE_ADMIN, ROLE_REGULAR
+from schemas import ConstantsResponse
+
+router = APIRouter(prefix="/api/meta", tags=["meta"])
+
+
+@router.get("/constants", response_model=ConstantsResponse)
+async def get_constants() -> ConstantsResponse:
+    """Get shared constants for frontend/backend synchronization."""
+    return ConstantsResponse(
+        permissions=[p.value for p in Permission],
+        roles=[ROLE_ADMIN, ROLE_REGULAR],
+        invite_statuses=[s.value for s in InviteStatus],
+    )
+