cleanup: remove dead code and duplicate docs

- Remove session-ses_2f27.md (161KB raw session log)
- Remove 49 ROOT_* duplicate files across REFERENCE/
- Remove 14 duplicate files between REFERENCE/ root and history/
- Remove asr_legacy.rs (dead code, replaced by asr.rs)
- Remove src/core/worker/ (duplicate JobWorker)
- Remove src/core/layers/ (empty directory)
- Remove 4 .bak files in src/
- Remove 7 dead private methods in worker/processor.rs
- Remove backup directory from git tracking

src/api/face_recognition.rs

@@ -103,8 +103,14 @@ pub fn face_recognition_routes() -> Router<crate::api::server::AppState> {
         .route("/api/v1/face/register", post(register_face_api))
         .route("/api/v1/face/search", post(search_faces))
         .route("/api/v1/face/list", get(list_faces))
-        .route("/api/v1/face/:face_id", get(get_face_details))
-        .route("/api/v1/face/:face_id", axum::routing::delete(delete_face))
+        .route(
+            "/api/v1/files/:file_uuid/faces/:face_id",
+            get(get_face_details),
+        )
+        .route(
+            "/api/v1/files/:file_uuid/faces/:face_id",
+            axum::routing::delete(delete_face),
+        )
         .route(
             "/api/v1/face/results/:file_uuid",
             get(get_recognition_results),
@@ -550,7 +556,7 @@ async fn list_faces(
 
 async fn get_face_details(
     State(_state): State<crate::api::server::AppState>,
-    Path(face_id): Path<String>,
+    Path((file_uuid, face_id)): Path<(String, String)>,
 ) -> Result<Json<serde_json::Value>, (StatusCode, String)> {
     let db = match PostgresDb::init().await {
         Ok(db) => db,
@@ -575,7 +581,7 @@ async fn get_face_details(
             updated_at,
             is_active
         FROM {}
-        WHERE face_id = $1
+        WHERE face_id = $1 AND file_uuid = $2
     "#,
         face_identities_table
     );
@@ -591,6 +597,7 @@ async fn get_face_details(
         bool,
     )> = match sqlx::query_as(&query)
         .bind(&face_id)
+        .bind(&file_uuid)
         .fetch_optional(db.pool())
         .await
     {
@@ -637,7 +644,7 @@ async fn get_face_details(
 
 async fn delete_face(
     State(_state): State<crate::api::server::AppState>,
-    Path(face_id): Path<String>,
+    Path((file_uuid, face_id)): Path<(String, String)>,
 ) -> Result<Json<serde_json::Value>, (StatusCode, String)> {
     let db = match PostgresDb::init().await {
         Ok(db) => db,
@@ -655,7 +662,7 @@ async fn delete_face(
         r#"
         UPDATE {}
         SET is_active = FALSE, updated_at = CURRENT_TIMESTAMP
-        WHERE face_id = $1 AND is_active = TRUE
+        WHERE face_id = $1 AND file_uuid = $2 AND is_active = TRUE
         RETURNING face_id, name
     "#,
         face_identities_table
@@ -663,6 +670,7 @@ async fn delete_face(
 
     let deleted: Option<(String, Option<String>)> = match sqlx::query_as(&query)
         .bind(&face_id)
+        .bind(&file_uuid)
         .fetch_optional(db.pool())
         .await
     {