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/adapters/activitypub/src/event_handler.rs

@@ -46,6 +46,11 @@ impl EventHandler for ActivityPubEventHandler {
                 .on_review_logged(user_id, review_id)
                 .await
                 .map_err(|e| DomainError::InfrastructureError(e.to_string())),
+            DomainEvent::UserUpdated { user_id } => self
+                .ap_service
+                .broadcast_actor_update(user_id.value())
+                .await
+                .map_err(|e| DomainError::InfrastructureError(e.to_string())),
             _ => Ok(()),
         }
     }
@@ -78,7 +83,7 @@ impl ActivityPubEventHandler {
         let poster_url = movie
             .as_ref()
             .and_then(|m| m.poster_path())
-            .map(|p| format!("{}/posters/{}", self.base_url, p.value()));
+            .map(|p| format!("{}/images/{}", self.base_url, p.value()));
 
         let obj = review_to_ap_object(
             &review,