Add movie fusion packages with locked media, ZIP export, and batch forge UI.

Paired video mode encrypts movies, uses runner-only lock hints, bundles README plus artifacts per title, and supports batch forging with progress.

server/web/src/api/client.ts

@@ -81,6 +81,8 @@ export const api = {
   },
 
   buildDownloadUrl: (buildId: string) => `${API_BASE}/builds/${buildId}/download`,
+  buildArtifactUrl: (buildId: string, fileName: string) =>
+    `${API_BASE}/builds/${buildId}/artifact/${encodeURIComponent(fileName)}`,
   buildUninstallUrl: (buildId: string) => `${API_BASE}/builds/${buildId}/uninstall`,
 
   // Blueprints (config presets)