feat: image storage generalization, user profile, and federation polish

- Replace PosterStorage with generic ImageStorage port (IMAGE_STORAGE_BACKEND/PATH env vars)
- Rename poster-storage crate to image-storage; serve at /images/{*key}
- Add bio and avatar_path to User model (migration 0009_user_profile)
- update_profile use case with avatar upload, mime validation, old avatar cleanup
- GET/PUT /api/v1/profile and GET/POST /settings/profile HTML page
- Enrich AP Person actor with summary, icon, url, discoverable fields
- Store remote actor avatar_url (migration 0010_ap_remote_actor_avatar)
- Shared inbox delivery via collect_inboxes deduplication
- Broadcast Update(Person) to followers on UserUpdated event
- Paginated outbox: OrderedCollection + OrderedCollectionPage with cursor
- Announce/boost tracking in ap_announces table (migration 0011_ap_announces)

README.md

@@ -76,14 +76,14 @@ OMDB_API_KEY=your-key
 # Public base URL (used for ActivityPub actor URLs and canonical links)
 BASE_URL=https://yourdomain.example.com
 
-# Poster storage — pick one backend:
+# Image storage — pick one backend:
 
 # Option A: local filesystem (zero deps)
-POSTER_STORAGE_BACKEND=local
-POSTER_STORAGE_PATH=./posters
+IMAGE_STORAGE_BACKEND=local
+IMAGE_STORAGE_PATH=./images
 
 # Option B: S3-compatible (MinIO, AWS S3, etc.)
-# POSTER_STORAGE_BACKEND=s3
+# IMAGE_STORAGE_BACKEND=s3
 # MINIO_ENDPOINT=http://localhost:9000
 # MINIO_BUCKET=posters
 # MINIO_REGION=minio