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-events.ts

@@ -16,8 +16,6 @@
  * chat-screen **不**直接创建 ChatWebSocket / 不读 AuthStorage（除 token 取值）。
  */
 export type ChatEvent =
-  // 内部 UI 事件
-  | { type: "ChatInit" }
   // 鉴权生命周期（**用户**显式触发登录后由 chat-screen 派）
   | { type: "ChatGuestLogin" }
   | { type: "ChatNonGuestLogin"; token: string }