feat(chat): sync multi-role backend APIs

src/stores/private-room/private-room-state.ts

@@ -22,7 +22,7 @@ export interface PrivateRoomState {
 }
 
 export function createInitialPrivateRoomState(
-  characterId = DEFAULT_CHARACTER_ID,
+  characterId: string,
 ): PrivateRoomState {
   return {
     characterId,
@@ -37,4 +37,4 @@ export function createInitialPrivateRoomState(
   };
 }
 
-export const initialState = createInitialPrivateRoomState();
+export const initialState = createInitialPrivateRoomState(DEFAULT_CHARACTER_ID);