feat: 实现减脂体重管理App完整功能

- 实现拍照识别食物功能（集成大语言模型视觉能力）
- 实现智能对话功能（集成大语言模型流式输出）
- 实现食物记录和卡路里管理功能
- 实现体重记录和统计功能
- 实现健康数据管理页面
- 配置数据库表结构（用户、食物记录、体重记录）
- 实现Express后端API路由
- 配置Tab导航和前端页面
- 采用健康运动配色方案

client/screens/home/styles.ts

@@ -0,0 +1,117 @@
+import { StyleSheet } from 'react-native';
+import { Spacing, BorderRadius, Theme } from '@/constants/theme';
+
+export const createStyles = (theme: Theme) => {
+  return StyleSheet.create({
+    scrollContent: {
+      flexGrow: 1,
+      paddingHorizontal: Spacing.lg,
+      paddingTop: Spacing.xl,
+      paddingBottom: Spacing["5xl"],
+    },
+    header: {
+      marginBottom: Spacing.xl,
+    },
+    calorieCard: {
+      padding: Spacing.xl,
+      marginBottom: Spacing.lg,
+      borderRadius: BorderRadius.xl,
+      shadowColor: theme.primary,
+      shadowOffset: { width: 0, height: 4 },
+      shadowOpacity: 0.1,
+      shadowRadius: 12,
+      elevation: 4,
+    },
+    weightCard: {
+      padding: Spacing.xl,
+      marginBottom: Spacing.xl,
+      borderRadius: BorderRadius.xl,
+      shadowColor: theme.primary,
+      shadowOffset: { width: 0, height: 4 },
+      shadowOpacity: 0.1,
+      shadowRadius: 12,
+      elevation: 4,
+    },
+    cardHeader: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      marginBottom: Spacing.lg,
+    },
+    iconContainer: {
+      width: 48,
+      height: 48,
+      borderRadius: BorderRadius.lg,
+      backgroundColor: theme.backgroundTertiary,
+      justifyContent: 'center',
+      alignItems: 'center',
+      marginRight: Spacing.md,
+    },
+    calorieContent: {
+      flexDirection: 'row',
+      alignItems: 'baseline',
+      marginBottom: Spacing.md,
+    },
+    weightContent: {
+      flexDirection: 'row',
+      alignItems: 'baseline',
+      marginBottom: Spacing.md,
+    },
+    progressBar: {
+      height: 8,
+      backgroundColor: theme.backgroundTertiary,
+      borderRadius: BorderRadius.full,
+      overflow: 'hidden',
+      marginBottom: Spacing.sm,
+    },
+    progressFill: {
+      height: '100%',
+      backgroundColor: theme.primary,
+      borderRadius: BorderRadius.full,
+    },
+    remainingText: {
+      textAlign: 'right',
+    },
+    quickActions: {
+      flexDirection: 'row',
+      justifyContent: 'space-between',
+      marginBottom: Spacing.xl,
+      gap: Spacing.md,
+    },
+    actionButton: {
+      flex: 1,
+      padding: Spacing.lg,
+      borderRadius: BorderRadius.xl,
+      alignItems: 'center',
+      shadowColor: theme.primary,
+      shadowOffset: { width: 0, height: 2 },
+      shadowOpacity: 0.15,
+      shadowRadius: 8,
+      elevation: 3,
+    },
+    cameraButton: {
+      backgroundColor: theme.primary,
+    },
+    chartButton: {
+      backgroundColor: '#10B981',
+    },
+    aiButton: {
+      backgroundColor: '#059669',
+    },
+    actionIconContainer: {
+      marginBottom: Spacing.sm,
+    },
+    recentSection: {
+      marginBottom: Spacing.xl,
+    },
+    sectionHeader: {
+      flexDirection: 'row',
+      justifyContent: 'space-between',
+      alignItems: 'center',
+      marginBottom: Spacing.lg,
+    },
+    emptyText: {
+      textAlign: 'center',
+      paddingVertical: Spacing["2xl"],
+    },
+  });
+};