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/cmd/agent/main.go

@@ -515,6 +515,13 @@ func (a *Agent) runJob(ctx context.Context, job *client.ClaimedJob) {
 		binds = append(binds, runner.Binding{Key: b.Key, Type: b.Type, Value: b.Value})
 	}
 
+	// Default empty engine to AfterEffects for backwards-compat with older
+	// orchestrators that don't send the field yet.
+	engine := job.Engine
+	if engine == "" {
+		engine = runner.EngineAfterEffects
+	}
+
 	rJob := &runner.Job{
 		JobID:          job.JobID,
 		SavedProjectID: job.SavedProjectID,
@@ -523,6 +530,8 @@ func (a *Agent) runJob(ctx context.Context, job *client.ClaimedJob) {
 		FrameRate:      job.FrameRate,
 		HasMusic:       job.HasMusic,
 		HasVoiceover:   job.HasVoiceover,
+		Engine:         engine,
+		RemotionDir:    a.cfg.RemotionProjectDir,
 		AEPFilePath:    aepPath,
 		CompName:       job.CompName,
 		AfterFxPath:    a.cfg.AfterFxPath,