Initial commit: Aurora Moments self-hosted photo/video sharing platform

Django/DRF + PostgreSQL/Redis/Celery backend with accounts, library,
moments, and notifications apps; React/TypeScript/Vite frontend with
Instagram-style sidebar nav, feed, profiles, nested comment replies,
notifications, and photo/video upload with ffmpeg-generated posters.

Co-Authored-By: Claude Sonnet 5 <[email protected]>

mobile/README.md

@@ -0,0 +1,10 @@
+# Aurora Moments — Mobile (planned)
+
+Not started yet. Per the V1 plan, the responsive web app plus the REST API
+are the priority; the React Native app (iOS first, then Android) starts
+once the API in [`../api`](../api) is stable, since the app is mainly a
+client for automatic photo backup and the two navigation surfaces
+(Library / Home feed).
+
+When this starts, it should reuse the same `/api/*` endpoints as the web
+app (see `api/apps/*/urls.py`) rather than growing a parallel API.