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/ports.rs

@@ -145,6 +145,13 @@ pub struct ImportPreviewPageData {
     pub rows: Vec<ImportPreviewRow>,
 }
 
+pub struct ProfileSettingsPageData {
+    pub ctx: HtmlPageContext,
+    pub bio: Option<String>,
+    pub avatar_url: Option<String>,
+    pub saved: bool,
+}
+
 pub trait HtmlRenderer: Send + Sync {
     fn render_diary_page(
         &self,
@@ -163,6 +170,10 @@ pub trait HtmlRenderer: Send + Sync {
     fn render_import_upload_page(&self, data: ImportUploadPageData) -> Result<String, String>;
     fn render_import_mapping_page(&self, data: ImportMappingPageData) -> Result<String, String>;
     fn render_import_preview_page(&self, data: ImportPreviewPageData) -> Result<String, String>;
+    fn render_profile_settings_page(
+        &self,
+        data: ProfileSettingsPageData,
+    ) -> Result<String, String>;
 }
 
 pub trait RssFeedRenderer: Send + Sync {