feat: search reindex, worker improvements, person IDs, user display names

- add admin POST /api/v1/admin/reindex-search endpoint + event-driven handler
- backfill persons from movie_cast/movie_crew into persons table
- paginate person list_page/backfill_from_credits_batch to cap memory
- concurrent worker event dispatch with semaphore (max 8)
- graceful worker shutdown (drain in-flight tasks on SIGINT)
- always ack events, log handler errors as warnings (no infinite retry)
- NATS ack_wait 600s, AtomicBool guard against concurrent reindex
- add username/display_name to UserSummaryDto and users list
- add person_id to CastMemberDto/CrewMemberDto via get_movie_profile use case
- add movie_id to wrapup MovieRef, person_id to wrapup PersonStat
- thread tmdb_person_id through wrapup cast pipeline
- add is_federated to FeedEntryDto
- cap orphaned persons query with LIMIT 500
- add SPA link to classic site footer

crates/domain/src/events.rs

@@ -84,6 +84,7 @@ pub enum DomainEvent {
     WrapUpCompleted {
         wrapup_id: WrapUpId,
     },
+    SearchReindexRequested,
 }
 
 #[async_trait]

crates/domain/src/models/mod.rs

@@ -461,6 +461,8 @@ impl FeedEntry {
 pub struct UserSummary {
     pub user_id: UserId,
     email: Email,
+    username: Username,
+    display_name: Option<String>,
     pub total_movies: i64,
     pub avg_rating: Option<f64>,
     pub avatar_path: Option<String>,
@@ -470,6 +472,8 @@ impl UserSummary {
     pub fn new(
         user_id: UserId,
         email: Email,
+        username: Username,
+        display_name: Option<String>,
         total_movies: i64,
         avg_rating: Option<f64>,
         avatar_path: Option<String>,
@@ -477,6 +481,8 @@ impl UserSummary {
         Self {
             user_id,
             email,
+            username,
+            display_name,
             total_movies,
             avg_rating,
             avatar_path,
@@ -485,6 +491,12 @@ impl UserSummary {
     pub fn email(&self) -> &str {
         self.email.value()
     }
+    pub fn username(&self) -> &str {
+        self.username.value()
+    }
+    pub fn display_name(&self) -> Option<&str> {
+        self.display_name.as_deref()
+    }
 }
 
 #[derive(Clone, Debug)]

crates/domain/src/models/wrapup.rs

@@ -36,6 +36,7 @@ impl DateRange {
 
 #[derive(Clone, Debug, Serialize, Deserialize)]
 pub struct MovieRef {
+    pub movie_id: Option<Uuid>,
     pub title: String,
     pub year: u16,
     pub runtime_minutes: Option<u32>,
@@ -50,6 +51,7 @@ pub struct UserRef {
 
 #[derive(Clone, Debug, Serialize, Deserialize)]
 pub struct PersonStat {
+    pub person_id: Option<Uuid>,
     pub name: String,
     pub count: u32,
     pub avg_rating: f64,

crates/domain/src/ports.rs

@@ -332,6 +332,12 @@ pub trait ImageRefQuery: Send + Sync {
 pub trait PersonCommand: Send + Sync {
     /// Upsert a batch of persons. Uses INSERT OR REPLACE (SQLite) / ON CONFLICT DO UPDATE (Postgres).
     async fn upsert_batch(&self, persons: &[Person]) -> Result<(), DomainError>;
+    /// Insert a batch of missing persons from movie_cast/movie_crew into the persons table.
+    /// Returns (inserted_count, has_more).
+    async fn backfill_from_credits_batch(
+        &self,
+        batch_size: u32,
+    ) -> Result<(u64, bool), DomainError>;
 }
 
 /// Read port — queries persons and credits. No mutations.
@@ -347,6 +353,7 @@ pub trait PersonQuery: Send + Sync {
     /// Returns persons who have no remaining entries in movie_cast or movie_crew.
     /// Called after movie deletion to find index entries that can be pruned.
     async fn list_orphaned_persons(&self) -> Result<Vec<PersonId>, DomainError>;
+    async fn list_page(&self, limit: u32, offset: u32) -> Result<Vec<Person>, DomainError>;
 }
 
 /// Read port — executes search queries. No mutations.
@@ -519,7 +526,7 @@ pub struct WrapUpMovieRow {
     pub original_language: Option<String>,
     pub genres: Vec<String>,
     pub keywords: Vec<String>,
-    pub cast_names: Vec<(String, u32)>,
+    pub cast_names: Vec<(String, u32, i64)>,
     pub cast_profile_paths: Vec<Option<String>>,
 }
 

crates/domain/src/testing.rs

@@ -672,6 +672,12 @@ impl PersonCommand for PanicPersonCommand {
     async fn upsert_batch(&self, _persons: &[Person]) -> Result<(), DomainError> {
         panic!("PanicPersonCommand called")
     }
+    async fn backfill_from_credits_batch(
+        &self,
+        _batch_size: u32,
+    ) -> Result<(u64, bool), DomainError> {
+        panic!("PanicPersonCommand called")
+    }
 }
 
 // ── PanicPersonQuery ──────────────────────────────────────────────────────────
@@ -698,6 +704,10 @@ impl PersonQuery for PanicPersonQuery {
     async fn list_orphaned_persons(&self) -> Result<Vec<PersonId>, DomainError> {
         panic!("PanicPersonQuery called")
     }
+
+    async fn list_page(&self, _limit: u32, _offset: u32) -> Result<Vec<Person>, DomainError> {
+        panic!("PanicPersonQuery called")
+    }
 }
 
 // ── PanicSearchPort ───────────────────────────────────────────────────────────