feat: AI-generated shorts render pipeline

- Remotion composition (ShortsVideo) renders 1080x1920 9:16 shorts
  from script segments (hook/setup/conflict/insight/cta) with animated
  gradient background, word-by-word captions, progress bar
- render-worker.mjs: standalone poller (systemd hermyhq-render.service)
  TTS via edge-tts → Remotion render via Chrome headless → ffmpeg mux +
  thumbnail; ≤60s gate; marks YoutubeScript rendered
- API: POST /api/youtube/render (queue approved→render_queued),
  GET status, GET /render/file (stream video/thumb with Range support)
- Schema: YoutubeScript.videoUrl/thumbnailUrl + YoutubeRender model
- UI: youtube tab gains Renders view (preview/review/approve/reject/
  download), Render Shorts button on approved scripts
- Prisma db push applied to prod DB

package.json

@@ -16,6 +16,8 @@
   "dependencies": {
     "@auth/prisma-adapter": "^1.6.0",
     "@prisma/client": "^6.19.2",
+    "@remotion/cli": "^4.0.527",
+    "@remotion/google-fonts": "^4.0.527",
     "@types/better-sqlite3": "^7.6.13",
     "@types/formidable": "^3.4.6",
     "better-sqlite3": "^12.11.1",
@@ -32,7 +34,8 @@
     "react-dnd": "^16.0.1",
     "react-dnd-html5-backend": "^16.0.1",
     "react-dom": "19.2.3",
-    "recharts": "^3.7.0"
+    "recharts": "^3.7.0",
+    "remotion": "^4.0.527"
   },
   "devDependencies": {
     "@tailwindcss/postcss": "^4",