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)

crates/application/src/context.rs

@@ -2,9 +2,10 @@ use std::sync::Arc;
 
 use domain::ports::{
     AuthService, DiaryExporter, DiaryRepository, DocumentParser, EventPublisher,
+    ImageStorage,
     ImportProfileRepository, ImportSessionRepository,
     MetadataClient, MovieRepository, PasswordHasher, PosterFetcherClient,
-    PosterStorage, ReviewRepository, StatsRepository, UserRepository,
+    ReviewRepository, StatsRepository, UserRepository,
 };
 
 use crate::config::AppConfig;
@@ -19,7 +20,7 @@ pub struct AppContext {
     pub stats_repository: Arc<dyn StatsRepository>,
     pub metadata_client: Arc<dyn MetadataClient>,
     pub poster_fetcher: Arc<dyn PosterFetcherClient>,
-    pub poster_storage: Arc<dyn PosterStorage>,
+    pub image_storage: Arc<dyn ImageStorage>,
     pub event_publisher: Arc<dyn EventPublisher>,
     pub auth_service: Arc<dyn AuthService>,
     pub password_hasher: Arc<dyn PasswordHasher>,