feat: 登陆注册UI调整，用户协议和隐私政策跳转调整

src/components/Auth/AuthModalManager.js

@@ -0,0 +1,84 @@
+// src/components/Auth/AuthModalManager.js
+import React from 'react';
+import {
+  Modal,
+  ModalOverlay,
+  ModalContent,
+  ModalBody,
+  ModalCloseButton,
+  useBreakpointValue
+} from '@chakra-ui/react';
+import { useAuthModal } from '../../contexts/AuthModalContext';
+import AuthFormContent from './AuthFormContent';
+
+/**
+ * 全局认证弹窗管理器
+ * 统一的登录/注册弹窗
+ */
+export default function AuthModalManager() {
+  const {
+    isAuthModalOpen,
+    closeModal
+  } = useAuthModal();
+
+  // 响应式尺寸配置
+  const modalSize = useBreakpointValue({
+    base: "full",    // 移动端：全屏
+    sm: "xl",        // 小屏：xl
+    md: "2xl",       // 中屏：2xl
+    lg: "4xl"        // 大屏：4xl
+  });
+
+  // 条件渲染：只在打开时才渲染 Modal，避免创建不必要的 Portal
+  if (!isAuthModalOpen) {
+    return null;
+  }
+
+  return (
+    <Modal
+      isOpen={isAuthModalOpen}
+      onClose={closeModal}
+      size={modalSize}
+      isCentered
+      closeOnOverlayClick={false}  // 防止误点击背景关闭
+      closeOnEsc={true}             // 允许ESC键关闭
+      scrollBehavior="inside"       // 内容滚动
+      zIndex={999}                  // 低于导航栏(1000)，不覆盖导航
+    >
+      {/* 半透明背景 + 模糊效果 */}
+      <ModalOverlay
+        bg="blackAlpha.700"
+        backdropFilter="blur(10px)"
+      />
+
+      {/* 弹窗内容容器 */}
+      <ModalContent
+        bg="white"
+        boxShadow="2xl"
+        borderRadius="2xl"
+        maxW={modalSize === "full" ? "100%" : "900px"}
+        my={modalSize === "full" ? 0 : 8}
+        position="relative"
+      >
+        {/* 关闭按钮 */}
+        <ModalCloseButton
+          position="absolute"
+          right={4}
+          top={4}
+          zIndex={9999}
+          color="gray.500"
+          bg="transparent"
+          _hover={{ bg: "gray.100" }}
+          borderRadius="full"
+          size="lg"
+          onClick={closeModal}
+        />
+
+        {/* 弹窗主体内容 */}
+        <ModalBody p={8}>
+          <AuthFormContent />
+        </ModalBody>
+      </ModalContent>
+    </Modal>
+  );
+}