fix(backend): validate waitlist status enum at API boundary

Changed WaitlistUpdateRequest.status from str to the actual enum type.
Pydantic now validates the status value, returning 422 for invalid
values instead of a misleading 404 "Waitlist not found" error.

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

autogpt_platform/backend/backend/api/features/store/db.py

@@ -2298,9 +2298,9 @@ async def update_waitlist_admin(
             k: v for k, v in field_mappings.items() if k in data.model_fields_set
         }
 
-        # Handle status separately due to enum conversion
+        # Add status if provided (already validated as enum by Pydantic)
         if "status" in data.model_fields_set and data.status is not None:
-            update_data["status"] = prisma.enums.WaitlistExternalStatus(data.status)
+            update_data["status"] = data.status
 
         if not update_data:
             # No updates, just return current data

autogpt_platform/backend/backend/api/features/store/model.py

@@ -270,7 +270,7 @@ class WaitlistUpdateRequest(pydantic.BaseModel):
     imageUrls: list[str] | None = None
     videoUrl: str | None = None
     agentOutputDemoUrl: str | None = None
-    status: str | None = None  # WaitlistExternalStatus enum value
+    status: prisma.enums.WaitlistExternalStatus | None = None
     storeListingId: str | None = None  # Link to a store listing