feat: harden deployment and public api handoff

lib/server/video-generation-service.ts

@@ -131,7 +131,8 @@ export async function syncVideoJob(jobId: string, origin: string): Promise<Gener
       capability: "video.generate",
       jobId: job.id,
       index: 0,
-      fallbackContentType: "video/mp4"
+      fallbackContentType: "video/mp4",
+      tags: assetTagsForJob(job)
     });
     await recordUsageEvent({
       ownerId: job.ownerId,
@@ -171,7 +172,7 @@ async function completeMockVideoJob(job: GenerationJob): Promise<GenerationJob>
     name: `mock-video-${job.id}.mp4`,
     url: "/mock/seedance-mock.mp4",
     source: "generated",
-    tags: ["video.generate", "mock"],
+    tags: [...assetTagsForJob(job), "mock"],
     metadata: {
       mock: true,
       capability: "video.generate",
@@ -203,3 +204,7 @@ function asRecord(value: unknown): Record<string, unknown> {
     ? value as Record<string, unknown>
     : {};
 }
+
+function assetTagsForJob(job: GenerationJob): string[] {
+  return job.externalClientId ? ["video.generate", `api-client:${job.externalClientId}`] : ["video.generate"];
+}