✨ feat: 完整应用重构 - 优化界面架构与用户体验

主要变更：
- 重构应用界面：优化首页、登录、认证流程
- 新增用户档案模块：包含完整的档案管理组件
- 优化路由结构：重新组织页面布局和导航
- 改进API集成：新增活动、内容分类等API模块
- 删除冗余组件：清理不必要的文件和依赖

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/(tabs)/_layout.tsx

@@ -1,8 +1,8 @@
 import { Tabs } from 'expo-router';
 import React from 'react';
+import { Image } from 'react-native';
 
 import { HapticTab } from '@/components/haptic-tab';
-import { IconSymbol } from '@/components/ui/icon-symbol';
 import { Colors } from '@/constants/theme';
 import { useAuth } from '@/hooks/use-auth';
 import { useColorScheme } from '@/hooks/use-color-scheme';
@@ -26,21 +26,36 @@ export default function TabLayout() {
         name="home"
         options={{
           title: 'Home',
-          tabBarIcon: ({ color }) => <IconSymbol size={28} name="paperplane.fill" color={color} />,
+          tabBarIcon: ({ color }) => (
+            <Image
+              source={require('@/assets/icons/home.svg')}
+              style={{ width: 28, height: 28, tintColor: color as any }}
+            />
+          ),
         }}
       />
       <Tabs.Screen
         name="history"
         options={{
           title: 'Content',
-          tabBarIcon: ({ color }) => <IconSymbol size={28} name="paperplane.fill" color={color} />,
+          tabBarIcon: ({ color }) => (
+            <Image
+              source={require('@/assets/icons/content.svg')}
+              style={{ width: 28, height: 28, tintColor: color as any }}
+            />
+          ),
         }}
       />
       <Tabs.Screen
         name="profile"
         options={{
           title: 'Profile',
-          tabBarIcon: ({ color }) => <IconSymbol size={28} name="person.fill" color={color} />,
+          tabBarIcon: ({ color }) => (
+            <Image
+              source={require('@/assets/icons/user.svg')}
+              style={{ width: 28, height: 28, tintColor: color as any }}
+            />
+          ),
         }}
       />
     </Tabs>