feat: Identity JSON sync mechanism

- storage.rs: add local_profile field, check disk for profile.jpg in save_identity_file_by_pool
- tmdb_api.rs: trigger JSON sync after TMDb probe
- identity_api.rs: upload_profile_image triggers JSON sync
- identity_binding.rs: bind/unbind/merge trigger JSON sync
- get_identity_json: replace DB fallback with Lazy Sync (generates JSON from DB if missing)
- Fixes missing/obsolete JSON files for all identity mutations

src/api/tmdb_api.rs

@@ -197,18 +197,41 @@ async fn tmdb_probe_handler(
     }
 
     match tmdb::probe::probe_from_cache(&state.db, &file_uuid).await {
-        Ok(result) => Ok(Json(TmdbProbeResponse {
-            success: true,
-            file_uuid,
-            tmdb_id: Some(result.tmdb_id),
-            movie_title: Some(result.title),
-            cast_count: Some(result.cast_count),
-            identities_created: Some(result.identities_created),
-            message: format!(
-                "Created/updated {} identities for movie ID {}",
-                result.identities_created, result.tmdb_id
-            ),
-        })),
+        Ok(result) => {
+            // Sync identity JSON files for newly created/updated identities
+            let pool = state.db.pool().clone();
+            let file_uuid_clone = file_uuid.clone();
+            tokio::spawn(async move {
+                // Query identities linked to this file
+                let fi_table = crate::core::db::schema::table_name("file_identities");
+                let query = format!(
+                    "SELECT i.uuid::text FROM {} fi JOIN {} i ON fi.identity_id = i.id WHERE fi.file_uuid = $1",
+                    fi_table, crate::core::db::schema::table_name("identities")
+                );
+                if let Ok(rows) = sqlx::query_scalar::<_, String>(&query)
+                    .bind(&file_uuid_clone)
+                    .fetch_all(&pool)
+                    .await
+                {
+                    for uuid in rows {
+                        let _ = crate::core::identity::storage::save_identity_file_by_pool(&pool, &uuid).await;
+                    }
+                }
+            });
+
+            Ok(Json(TmdbProbeResponse {
+                success: true,
+                file_uuid,
+                tmdb_id: Some(result.tmdb_id),
+                movie_title: Some(result.title),
+                cast_count: Some(result.cast_count),
+                identities_created: Some(result.identities_created),
+                message: format!(
+                    "Created/updated {} identities for movie ID {}",
+                    result.identities_created, result.tmdb_id
+                ),
+            }))
+        }
         Err(e) => {
             let msg = e.to_string();
             if msg.contains("not found") {