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/node-agent/internal/runner/runner.go

@@ -46,6 +46,11 @@ type Job struct {
 	FrameRate      int
 	HasMusic       bool
 	HasVoiceover   bool
+	// Engine selects the render engine: EngineAfterEffects (default, "" treated as
+	// AE for backwards-compat) or EngineRemotion (code-based React templates).
+	Engine string
+	// RemotionDir is the Remotion project root, used only when Engine == EngineRemotion.
+	RemotionDir string
 	// AEPFilePath is the local path to the downloaded .aep project file.
 	// In a full implementation the agent downloads this from MinIO before calling Run.
 	AEPFilePath string
@@ -75,6 +80,12 @@ func Run(ctx context.Context, aePath, workDir string, job *Job, onProgress Progr
 	}
 	outputPath := filepath.Join(outputDir, "output.mp4")
 
+	// Engine dispatch. Remotion is fully self-contained (Node + Chrome), so it
+	// never touches the AE / mock paths below.
+	if strings.EqualFold(job.Engine, EngineRemotion) {
+		return RunRemotion(ctx, job.RemotionDir, job, outputPath, onProgress, onPreview)
+	}
+
 	// Mock render when AE isn't installed (aePath empty) OR when this job has no
 	// template project to render (AEPFilePath empty — the template bundle wasn't
 	// uploaded/promoted yet). Mock drives progress+preview to completion so the job