feat(chat): handle daily message paywall

src/stores/chat/chat-state.ts

@@ -21,12 +21,17 @@ export interface ChatState {
    * - false：走 HTTP，消耗次数
    */
   wsConnected: boolean;
+  /** 当前非游客用户是否 VIP；游客会话固定 false。 */
+  isVip: boolean;
   /** 游客剩余配额（次/天）—— 仅游客业务展示用
    */
   guestRemainingQuota: number;
   /** 游客总配额（仅游客展示用） */
   guestTotalQuota: number;
   quotaExceededTrigger: number;
+  paywallTriggered: boolean;
+  paywallReason: "daily_limit" | null;
+  paywallDetail: { usedToday: number; limit: number } | null;
   isLoadingMore: boolean;
   hasMore: boolean;
   historyOffset: number;
@@ -46,9 +51,13 @@ export const initialState: ChatState = {
   messages: [],
   isReplyingAI: false,
   wsConnected: false,
+  isVip: false,
   guestRemainingQuota: 0,
   guestTotalQuota: 0,
   quotaExceededTrigger: 0,
+  paywallTriggered: false,
+  paywallReason: null,
+  paywallDetail: null,
   isLoadingMore: false,
   hasMore: true,
   historyOffset: 0,