feat(models): update AI subagent session with role fields and room streaming

Add role_name and parent_call_id fields to subagent session model.
Update room struct and AI streaming service to align with new
sub-agent orchestration.

libs/room/src/room.rs

@@ -161,8 +161,11 @@ impl RoomService {
         project_id: Uuid,
         user_id: Uuid,
     ) {
-        self.invalidate_room_list_cache_for_prefix(&format!("room:list:{}:{}:", project_id, user_id))
-            .await;
+        self.invalidate_room_list_cache_for_prefix(&format!(
+            "room:list:{}:{}:",
+            project_id, user_id
+        ))
+        .await;
     }
 
     async fn invalidate_room_list_cache_for_prefix(&self, prefix: &str) {

libs/room/src/service/ai_streaming.rs

@@ -247,7 +247,10 @@ pub async fn process_message_ai_streaming(
             }
         });
 
-        match chat_service.process_room_stream(request, stream_callback, room_tools).await {
+        match chat_service
+            .process_room_stream(request, stream_callback, room_tools)
+            .await
+        {
             Ok(result) => {
                 // Store ordered chunks as JSON in thinking_content for ordered replay.
                 // Uses {"__chunks__": [...]} marker so legacy plain-text still works.