feat(membership): 实现会员系统和购买流程

- 创建 MembershipModalContext 统一管理会员弹窗
- 优化 MembershipModal 产品套餐展示和购买流程
- 集成 RevenueCat SDK 并初始化内购功能
- 在个人中心添加会员 Banner，引导非会员用户订阅
- 修复日志工具的循环引用问题，确保错误信息正确记录
- 版本更新至 1.0.20

新增了完整的会员购买流程，包括套餐选择、购买确认、购买恢复等功能。会员 Banner 仅对非会员用户展示，已是会员的用户不会看到。同时优化了错误日志记录，避免循环引用导致的序列化失败。

contexts/MembershipModalContext.tsx

@@ -0,0 +1,88 @@
+import React, { createContext, useCallback, useContext, useEffect, useMemo, useState } from 'react';
+import Purchases from 'react-native-purchases';
+
+import { MembershipModal } from '@/components/model/MembershipModal';
+import { logger } from '@/utils/logger';
+
+type MembershipModalOptions = {
+  onPurchaseSuccess?: () => void;
+};
+
+interface MembershipModalContextValue {
+  openMembershipModal: (options?: MembershipModalOptions) => void;
+  closeMembershipModal: () => void;
+}
+
+const MembershipModalContext = createContext<MembershipModalContextValue | null>(null);
+
+export function MembershipModalProvider({ children }: { children: React.ReactNode }) {
+  const [visible, setVisible] = useState(false);
+  const [pendingSuccessCallback, setPendingSuccessCallback] = useState<(() => void) | undefined>();
+  const [isInitialized, setIsInitialized] = useState(false);
+
+  useEffect(() => {
+    // 直接使用生产环境的 API Key，避免环境变量问题
+    const iosApiKey = 'appl_lmVvuLWFlXlrEsnvxMzTnKapqcc';
+
+    const initializeRevenueCat = async () => {
+      try {
+        // 检查是否已经配置过，避免重复配置
+        if (!isInitialized) {
+          await Purchases.configure({ apiKey: iosApiKey });
+          setIsInitialized(true);
+          console.log('[MembershipModalProvider] RevenueCat SDK 初始化成功');
+        }
+      } catch (error) {
+        console.error('[MembershipModalProvider] RevenueCat SDK 初始化失败:', error);
+        // 初始化失败时不阻止应用正常运行
+      }
+    };
+
+    initializeRevenueCat();
+  }, [isInitialized]);
+
+  const openMembershipModal = useCallback((options?: MembershipModalOptions) => {
+    setPendingSuccessCallback(() => options?.onPurchaseSuccess);
+    setVisible(true);
+  }, []);
+
+  const closeMembershipModal = useCallback(() => {
+    setVisible(false);
+    setPendingSuccessCallback(undefined);
+  }, []);
+
+  const handlePurchaseSuccess = useCallback(() => {
+    pendingSuccessCallback?.();
+  }, [pendingSuccessCallback]);
+
+  const contextValue = useMemo(
+    () => ({
+      openMembershipModal,
+      closeMembershipModal,
+    }),
+    [closeMembershipModal, openMembershipModal],
+  );
+
+  return (
+    <MembershipModalContext.Provider value={contextValue}>
+      {children}
+      <MembershipModal
+        visible={visible}
+        onClose={closeMembershipModal}
+        onPurchaseSuccess={handlePurchaseSuccess}
+      />
+    </MembershipModalContext.Provider>
+  );
+}
+
+export function useMembershipModal(): MembershipModalContextValue {
+  const context = useContext(MembershipModalContext);
+
+  if (!context) {
+    logger.error('useMembershipModal must be used within a MembershipModalProvider');
+    // 抛出错误而不是返回 undefined，确保类型安全
+    throw new Error('useMembershipModal must be used within a MembershipModalProvider');
+  }
+
+  return context;
+}