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)

Cargo.lock

@@ -2399,6 +2399,20 @@ dependencies = [
  "icu_properties",
 ]
 
+[[package]]
+name = "image-storage"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+ "async-trait",
+ "domain",
+ "infer",
+ "object_store",
+ "tokio",
+ "tracing",
+ "uuid",
+]
+
 [[package]]
 name = "impl-more"
 version = "0.1.9"
@@ -3424,20 +3438,6 @@ dependencies = [
  "reqwest 0.13.3",
 ]
 
-[[package]]
-name = "poster-storage"
-version = "0.1.0"
-dependencies = [
- "anyhow",
- "async-trait",
- "domain",
- "infer",
- "object_store",
- "tokio",
- "tracing",
- "uuid",
-]
-
 [[package]]
 name = "poster-sync"
 version = "0.1.0"
@@ -3539,13 +3539,13 @@ dependencies = [
  "dotenvy",
  "export",
  "http-body-util",
+ "image-storage",
  "importer",
  "infer",
  "metadata",
  "nats",
  "percent-encoding",
  "poster-fetcher",
- "poster-storage",
  "postgres",
  "postgres-event-queue",
  "postgres-federation",
@@ -6340,11 +6340,11 @@ dependencies = [
  "dotenvy",
  "export",
  "futures",
+ "image-storage",
  "importer",
  "metadata",
  "nats",
  "poster-fetcher",
- "poster-storage",
  "poster-sync",
  "postgres",
  "postgres-event-queue",