fix: submissions module constructs its own VideoService (root-module provider not importable)

apps/api/src/submissions/submissions.module.ts

@@ -14,14 +14,17 @@ import { SUBMISSION_DEPS, SubmissionsService } from "./submissions.service.js";
   providers: [
     SubmissionsService,
     {
+      // VideoService is registered in the root module's providers, not a
+      // feature module — construct our own (stateless over the pool + S3).
       provide: SUBMISSION_DEPS,
-      useFactory: (video: VideoService | null) => ({
-        storage: null,
-        videoUpload: video === null
-          ? null
-          : (workspaceId: string, storageKey: string, mimeType: string, sizeBytes: number) => video.uploadVideo(workspaceId, storageKey, mimeType, sizeBytes),
-      }),
-      inject: [VideoService],
+      useFactory: () => {
+        const video = new VideoService();
+        return {
+          storage: null,
+          videoUpload: (workspaceId: string, storageKey: string, mimeType: string, sizeBytes: number) =>
+            video.uploadVideo(workspaceId, storageKey, mimeType, sizeBytes),
+        };
+      },
     },
   ],
   exports: [SubmissionsService],