chore(chat): refactor chat init into separate quota and history actors

Split `chatInitActor` into `loadQuotaActor` (guest quota fetch) and `loadHistoryActor` (local → network → save sync), and add `quotaLoaded` / `historyLoaded` state flags so the UI can display loading status during the new local-first history hydration flow. Also drop the now-unused `ChatInit` event and pipe Next.js stdout/stderr to a persistent log file in the post-receive hook for easier troubleshooting.

src/stores/chat/chat-context.tsx

@@ -40,6 +40,10 @@ interface ChatState {
   isLoadingMore: boolean;
   hasMore: boolean;
   historyOffset: number;
+  /** 游客配额加载完成标**志**（**仅** guestSession 期间） —— UI 可**用**此**显**示 loading */
+  quotaLoaded: boolean;
+  /** history 初始加**载**完成标**志**（local → network → save 跑**完**） —— UI 可**用**此**显**示 loading */
+  historyLoaded: boolean;
 }
 
 const ChatStateCtx = createContext<ChatState | null>(null);
@@ -63,6 +67,8 @@ export function ChatProvider({ children }: ChatProviderProps) {
       isLoadingMore: state.context.isLoadingMore,
       hasMore: state.context.hasMore,
       historyOffset: state.context.historyOffset,
+      quotaLoaded: state.context.quotaLoaded,
+      historyLoaded: state.context.historyLoaded,
     }),
     [state],
   );