refactor(chat): rely on server message limits

src/stores/chat/chat-context.tsx

@@ -21,19 +21,12 @@ import type { ChatEvent, ChatState as MachineContext } from "./chat-machine";
 interface ChatState {
   messages: MachineContext["messages"];
   isReplyingAI: boolean;
-  /** 游客剩余配额（次/天）—— 业务展示用，鉴权判断由 chat-screen 派生 loginStatus */
-  guestRemainingQuota: number;
-  /** 游客总配额 */
-  guestTotalQuota: number;
-  quotaExceededTrigger: number;
   paywallTriggered: boolean;
   paywallReason: MachineContext["paywallReason"];
   paywallDetail: MachineContext["paywallDetail"];
   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;
 }
@@ -53,16 +46,12 @@ export function ChatProvider({ children }: ChatProviderProps) {
     () => ({
       messages: state.context.messages,
       isReplyingAI: state.context.isReplyingAI,
-      guestRemainingQuota: state.context.guestRemainingQuota,
-      guestTotalQuota: state.context.guestTotalQuota,
-      quotaExceededTrigger: state.context.quotaExceededTrigger,
       paywallTriggered: state.context.paywallTriggered,
       paywallReason: state.context.paywallReason,
       paywallDetail: state.context.paywallDetail,
       isLoadingMore: state.context.isLoadingMore,
       hasMore: state.context.hasMore,
       historyOffset: state.context.historyOffset,
-      quotaLoaded: state.context.quotaLoaded,
       historyLoaded: state.context.historyLoaded,
     }),
     [state],