Add Remotion promo video project with 7-scene App Store flow

- Create feels-promo Remotion project for promotional videos
- Implement FeelsPromoV1 with scenes matching App Store screenshots:
  - Hero scene with mood tracking
  - Widget + Apple Watch scene
  - Journal notes with photos
  - AI-powered insights with badge
  - Privacy & security features
  - Theme customization
  - Notification styles
- Add screens folder with source assets and flow reference
- Include phone frames, widget, and watch frame assets

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

feels-promo/src/index.ts

@@ -0,0 +1,7 @@
+// This is your entry file! Refer to it when you render:
+// npx remotion render <entry-file> HelloWorld out/video.mp4
+
+import { registerRoot } from "remotion";
+import { RemotionRoot } from "./Root";
+
+registerRoot(RemotionRoot);