fix(mp): 安全修复 + 健康Tab重构为总览

Phase 0 安全修复：
- 移除 secure-storage-aes.ts 硬编码 'hms-default-key' fallback
- production 模式空密钥时拒绝加解密（返回空/不加密）
- dev 模式保留明文兼容（warn 日志提醒）
- .env/.env.h5 注入随机加密密钥
- secureGet 明文 fallback 按环境分级处理
- 新增 8 个测试覆盖空密钥 dev/production 行为

Phase 1 健康Tab重构：
- health/index.tsx 从体征录入页改为健康总览Dashboard
- 新增今日体征摘要卡片（2x2 网格 + 状态标签）
- 新增快捷入口（录入体征/趋势/报告/用药）
- 新增告警提示卡片（待处理告警数量）
- 体征录入移至 pkg-health/input/index（已有页面）
- useHealthData → useHealthOverview（新增 alertCount）

首页增强：
- useHomeData 新增告警计数查询（listPatientAlerts）
- 首页新增告警提示卡片入口
- "记录体征"按钮改为跳转录入页而非健康Tab

apps/miniprogram/src/pages/health/useHealthOverview.ts

@@ -0,0 +1,112 @@
+import { useState } from 'react';
+import { useHealthStore } from '@/stores/health';
+import { useAuthStore } from '@/stores/auth';
+import { usePageData } from '@/hooks/usePageData';
+import { getHealthThresholds, DEFAULT_THRESHOLDS, type HealthThreshold } from '@/services/health';
+import { listPendingSuggestions, type AiSuggestionItem } from '@/services/ai-analysis';
+import { listPatientAlerts } from '@/services/alert';
+
+export type VitalType = 'blood_pressure' | 'heart_rate' | 'blood_sugar' | 'weight';
+
+export const VITAL_TABS: { key: VitalType; label: string }[] = [
+  { key: 'blood_pressure', label: '血压' },
+  { key: 'heart_rate', label: '心率' },
+  { key: 'blood_sugar', label: '血糖' },
+  { key: 'weight', label: '体重' },
+];
+
+export interface TrendPoint {
+  date: string;
+  value: number;
+}
+
+export function useHealthOverview() {
+  const user = useAuthStore((s) => s.user);
+  const todaySummary = useHealthStore((s) => s.todaySummary);
+  const loading = useHealthStore((s) => s.loading);
+  const refreshToday = useHealthStore((s) => s.refreshToday);
+  const fetchTrend = useHealthStore((s) => s.getTrend);
+
+  const [activeTab, setActiveTab] = useState<VitalType>('blood_pressure');
+  const [trendData, setTrendData] = useState<TrendPoint[]>([]);
+  const [trendLoading, setTrendLoading] = useState(false);
+  const [aiSuggestions, setAiSuggestions] = useState<AiSuggestionItem[]>([]);
+  const [thresholds, setThresholds] = useState<HealthThreshold[]>(DEFAULT_THRESHOLDS);
+  const [alertCount, setAlertCount] = useState(0);
+
+  const loadTrend = async (type: VitalType) => {
+    setTrendLoading(true);
+    try {
+      const indicatorMap: Record<VitalType, string> = {
+        blood_pressure: 'systolic_bp_morning',
+        heart_rate: 'heart_rate',
+        blood_sugar: 'blood_sugar',
+        weight: 'weight',
+      };
+      const points = await fetchTrend(indicatorMap[type], '7d');
+      setTrendData(points);
+    } catch (err) {
+      console.warn('[health] 加载趋势数据失败:', err);
+      setTrendData([]);
+    } finally {
+      setTrendLoading(false);
+    }
+  };
+
+  const loadAiSuggestions = async () => {
+    try {
+      const items = await listPendingSuggestions();
+      setAiSuggestions(items.slice(0, 3));
+    } catch {
+      setAiSuggestions([]);
+    }
+  };
+
+  const loadAlertCount = async () => {
+    const patientId = useAuthStore.getState().currentPatient?.id;
+    if (!patientId) return;
+    try {
+      const res = await listPatientAlerts(patientId, { status: 'pending', page: 1, page_size: 1 });
+      setAlertCount(res.total ?? 0);
+    } catch {
+      setAlertCount(0);
+    }
+  };
+
+  const fetchData = async () => {
+    const results = await Promise.allSettled([
+      refreshToday(),
+      loadTrend(activeTab),
+      loadAiSuggestions(),
+      loadAlertCount(),
+      getHealthThresholds().then((t) => { if (t.length > 0) setThresholds(t); }),
+    ]);
+    return results;
+  };
+
+  usePageData(fetchData, {
+    throttleMs: 5000,
+    enablePullDown: true,
+    enabled: !!user,
+  });
+
+  const handleTabChange = (tab: VitalType) => {
+    setActiveTab(tab);
+    loadTrend(tab);
+  };
+
+  return {
+    user,
+    todaySummary,
+    loading,
+    error: false,
+    activeTab,
+    trendData,
+    trendLoading,
+    aiSuggestions,
+    thresholds,
+    alertCount,
+    handleTabChange,
+    fetchData,
+  };
+}