feat(cms): add VDO Frame Scrubber block with isolated sequence library

apps/backend/public/frame-sequences/chrome-sprocket-428h/manifest.json

@@ -0,0 +1,13 @@
+{
+  "id": "seq_chrome-sprocket-428h",
+  "name": "Chrome Sprocket 428h",
+  "slug": "chrome-sprocket-428h",
+  "folderPath": "/frame-sequences/chrome-sprocket-428h",
+  "pattern": "frame-{index}.webp",
+  "padding": 3,
+  "totalFrames": 432,
+  "fps": 24,
+  "durationSeconds": 18,
+  "posterUrl": "/frame-sequences/chrome-sprocket-428h/frame-001.webp",
+  "createdAt": "2026-10-17T04:21:52.208Z"
+}