feat: goals — "watch N movies in YEAR" with progress bar

Domain: Goal entity, UserSettings (federation toggle), RemoteGoalEntry.
Ports: GoalRepository, UserSettingsRepository, RemoteGoalRepository.
Adapters: sqlite + postgres repos, migrations, AP content query extensions.
Application: CRUD use cases (create/update/delete/get/list), settings use cases.
API: 7 endpoints (/goals CRUD, /users/{id}/goals, /settings) with utoipa docs.
Federation: GoalObject (Note + goal discriminator), outbound broadcast with
per-user toggle, inbound GoalObjectHandler in CompositeObjectHandler.
SPA: API client + hooks, GoalCard (shadcn Card+Progress+DropdownMenu),
GoalSheet (Drawer), profile integration (editable own, read-only others),
federation toggle in settings (Switch).
Classic HTML: glassmorphic goal card on profile, Frutiger Aero styling.
Progress computed from existing reviews — backwards compatible.

crates/adapters/activitypub/src/urls.rs

@@ -13,6 +13,11 @@ pub fn review_url(base_url: &str, review_id: &ReviewId) -> Url {
         .expect("base_url is always a valid URL prefix")
 }
 
+pub fn goal_url(base_url: &str, user_id: uuid::Uuid, year: u16) -> Url {
+    Url::parse(&format!("{}/users/{}/goals/{}", base_url, user_id, year))
+        .expect("base_url is always a valid URL prefix")
+}
+
 /// Builds the canonical watchlist entry URL: `{base_url}/users/{user_id}/watchlist/{movie_id}`
 pub fn watchlist_entry_url(base_url: &str, user_id: uuid::Uuid, movie_id: uuid::Uuid) -> Url {
     Url::parse(&format!(