feat(render+templates): Remotion engine, 16 branded templates (incl. 3D), seconds pricing, coming-soon

Render engine
- Add Remotion (code-based) as a 2nd render engine alongside After Effects.
  node-agent dispatches on Job.Engine; RunRemotion maps bindings -> --props,
  renders native then ffmpeg-scales to the quality tier (aspect-preserving).
- content.projects.render_engine + render_remotion_comp (migration 32);
  render-svc claim resolves engine and routes (skips .aep for Remotion).
- Admin TemplatesAdmin gains an engine picker + Remotion composition id field.

Template pack (services/remotion)
- 16 branded, Persian (Vazirmatn), color- and text-editable templates, each in
  3 aspects (16:9 / 1:1 / 9:16): LogoMotion, Opener, InstaPromo, YouTubeIntro,
  Slideshow, HappyBirthday, SalePromo, QuoteCard, EventInvite, Countdown,
  GlitterReveal (editable logo image), NowruzGreeting (animated characters),
  and 4 cinematic 3D templates via @remotion/three (Hero3D, Nowruz3D,
  Birthday3D, Promo3D) with reflections + bloom/DOF/vignette.
- scripts/seed_remotion_templates.py seeds containers/projects/scenes/colors.

Pricing
- Rewrite /pricing to the seconds-based model (charge = length x resolution),
  data-driven from /v1/plans, Toman, broker checkout.

Coming-soon
- Persian experimental-build overlay on all pages (launch date + countdown).

Fixes
- middleware matcher bypasses all static asset paths; catalog mapping passes
  cover image + preview video so real thumbnails render.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

services/remotion/package.json

@@ -0,0 +1,31 @@
+{
+  "name": "flatrender-remotion",
+  "version": "0.1.0",
+  "private": true,
+  "description": "FlatRender code-based (Remotion) video template renderer",
+  "scripts": {
+    "dev": "remotion studio",
+    "render": "remotion render",
+    "still": "remotion still",
+    "upgrade": "remotion upgrade"
+  },
+  "dependencies": {
+    "@react-three/drei": "^10.7.7",
+    "@react-three/fiber": "^9.1.2",
+    "@react-three/postprocessing": "^3.0.4",
+    "@remotion/cli": "4.0.290",
+    "@remotion/three": "^4.0.290",
+    "@remotion/zod-types": "4.0.290",
+    "@types/three": "^0.171.0",
+    "postprocessing": "^6.39.1",
+    "react": "19.0.0",
+    "react-dom": "19.0.0",
+    "remotion": "4.0.290",
+    "three": "^0.171.0",
+    "zod": "3.22.3"
+  },
+  "devDependencies": {
+    "@types/react": "19.0.0",
+    "typescript": "5.5.4"
+  }
+}