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/config/config.go

@@ -85,6 +85,10 @@ type Config struct {
 	// WorkDir is the scratch directory for render temp files and AE project copies.
 	WorkDir string
 
+	// RemotionProjectDir is the Remotion project root (package.json + src/index.ts)
+	// used by the code-based render engine. Empty disables Remotion jobs on this node.
+	RemotionProjectDir string
+
 	// HeartbeatIntervalSec is how often the agent sends a heartbeat to the orchestrator.
 	HeartbeatIntervalSec int
 
@@ -115,6 +119,7 @@ func Load() (*Config, error) {
 		AEPath:               getEnv("AE_PATH", ""),
 		AfterFxPath:          getEnv("AFTERFX_PATH", ""),
 		WorkDir:              getEnv("WORK_DIR", os.TempDir()),
+		RemotionProjectDir:   getEnv("REMOTION_PROJECT_DIR", ""),
 		AgentVersion:         getEnv("AGENT_VERSION", "0.1.0"),
 		AEVersion:            getEnv("AE_VERSION", "2024"),
 		HeartbeatIntervalSec: getInt("HEARTBEAT_INTERVAL_SEC", 5),