feat: add queued status + FIFO queue ordering

- Add Queued variant to VideoStatus enum
- Trigger sets videos.status='queued' instead of staying 'pending'
- Worker sets videos.status='processing' on pickup
- list_monitor_jobs_by_status ORDER BY created_at ASC (FIFO)
- queue_position counts both 'pending' and 'queued' jobs

src/api/identity_api.rs

@@ -1289,6 +1289,8 @@ pub struct SetProfileFromFaceRequest {
     pub file_uuid: String,
     pub face_id: Option<String>,
     pub id: Option<i64>,
+    pub trace_id: Option<i32>,
+    pub frame_number: Option<i64>,
 }
 
 async fn set_profile_from_face(
@@ -1302,20 +1304,40 @@ async fn set_profile_from_face(
 
     let uuid_clean = identity_uuid.replace('-', "");
 
-    let face_identifier = match (&req.face_id, req.id) {
-        (Some(fid), _) => fid.clone(),
-        (None, Some(id)) => id.to_string(),
-        (None, None) => {
+    let (face_identifier, use_trace, use_frame) = match (&req.face_id, req.id, req.trace_id) {
+        (Some(fid), _, _) => (fid.clone(), false, None),
+        (None, Some(id), _) => (id.to_string(), false, None),
+        (None, None, Some(trace_id)) => (trace_id.to_string(), true, req.frame_number),
+        (None, None, None) => {
             return Err((
                 StatusCode::BAD_REQUEST,
-                Json(serde_json::json!({"success": false, "message": "Either face_id or id is required"})),
+                Json(serde_json::json!({"success": false, "message": "Either face_id, id, or trace_id is required"})),
             ));
         }
     };
 
-    let use_id_field = req.id.is_some();
-
-    let row: Option<(i64, i32, i32, i32, i32, f64)> = if use_id_field {
+    let row: Option<(i64, i32, i32, i32, i32, f64)> = if use_trace {
+        if let Some(frame) = use_frame {
+            sqlx::query_as(&format!(
+                "SELECT frame_number, x, y, width, height, confidence FROM {} WHERE file_uuid = $1 AND trace_id = $2 AND frame_number = $3 LIMIT 1",
+                fd_table
+            ))
+            .bind(&req.file_uuid)
+            .bind(use_trace)
+            .bind(frame as i32)
+            .fetch_optional(state.db.pool())
+            .await
+        } else {
+            sqlx::query_as(&format!(
+                "SELECT frame_number, x, y, width, height, confidence FROM {} WHERE file_uuid = $1 AND trace_id = $2 ORDER BY confidence DESC LIMIT 1",
+                fd_table
+            ))
+            .bind(&req.file_uuid)
+            .bind(use_trace)
+            .fetch_optional(state.db.pool())
+            .await
+        }
+    } else if req.id.is_some() {
         sqlx::query_as(&format!(
             "SELECT frame_number, x, y, width, height, confidence FROM {} WHERE file_uuid = $1 AND id = $2",
             fd_table