feat: 新增任务管理功能及相关组件

- 将目标页面改为任务列表，支持任务的创建、完成和跳过功能
- 新增任务卡片和任务进度卡片组件，展示任务状态和进度
- 实现任务数据的获取和管理，集成Redux状态管理
- 更新API服务，支持任务相关的CRUD操作
- 编写任务管理功能实现文档，详细描述功能和组件架构

components/statistic/OxygenSaturationCard.tsx

@@ -0,0 +1,48 @@
+import { Ionicons } from '@expo/vector-icons';
+import React, { useEffect, useState } from 'react';
+import { StyleSheet } from 'react-native';
+import HealthDataService from '../../services/healthData';
+import HealthDataCard from './HealthDataCard';
+
+interface OxygenSaturationCardProps {
+  resetToken: number;
+  style?: object;
+}
+
+const OxygenSaturationCard: React.FC<OxygenSaturationCardProps> = ({
+  resetToken,
+  style
+}) => {
+  const [oxygenSaturation, setOxygenSaturation] = useState<number | null>(null);
+
+  useEffect(() => {
+    const fetchOxygenSaturation = async () => {
+      const data = await HealthDataService.getOxygenSaturation();
+      setOxygenSaturation(data);
+    };
+
+    fetchOxygenSaturation();
+  }, [resetToken]);
+
+  const oxygenIcon = (
+    <Ionicons name="water" size={24} color="#3B82F6" />
+  );
+
+  return (
+    <HealthDataCard
+      title="血氧饱和度"
+      value={oxygenSaturation !== null ? oxygenSaturation.toString() : '--'}
+      unit="%"
+      icon={oxygenIcon}
+      style={style}
+    />
+  );
+};
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+  },
+});
+
+export default OxygenSaturationCard;