fix(health): 设备数据管线 Phase 1 缺陷修复 + AI 产品策略讨论

- device_readings 批量插入添加 ON CONFLICT 去重唯一索引
- 小程序 BLEManager 增加离线缓存（Storage 持久化 + 启动重传）
- 新增 device_readings 90 天数据保留清理定时任务
- 小米手环适配器增加 RACP 历史心率读取支持
- SSE 告警按医生过滤已确认实现（patient_doctor_relation）
- 新增 AI 产品策略与设备数据医院场景讨论记录

apps/miniprogram/src/services/ble/BLEManager.ts

@@ -9,6 +9,9 @@ import type {
   BLEManagerConfig,
 } from './types';
 
+const CACHE_KEY = 'ble_pending_readings';
+const CACHE_MAX = 2000;
+
 const DEFAULT_CONFIG: BLEManagerConfig = {
   scanTimeout: 10000,
   maxReadingsPerSync: 500,
@@ -179,6 +182,7 @@ export class BLEManager {
         );
         if (newReadings.length > 0) {
           this.readings = [...this.readings, ...newReadings];
+          this.persistPendingReadings();
           this.onReadings?.(newReadings);
         }
       });
@@ -248,6 +252,7 @@ export class BLEManager {
       try {
         const uploaded = await uploadFn(batch);
         this.readings = this.readings.slice(batch.length);
+        this.clearPendingReadings();
         this.updateState('connected');
         return {
           success: true,
@@ -303,6 +308,50 @@ export class BLEManager {
   clearReadings(): void {
     this.readings = [];
   }
+
+  // ── 离线缓存 ──
+
+  /** 将当前未上传读数同步写入 Storage */
+  private persistPendingReadings(): void {
+    try {
+      const batch = this.readings.slice(-CACHE_MAX);
+      Taro.setStorageSync(CACHE_KEY, JSON.stringify(batch));
+    } catch {
+      // Storage 写入失败不影响主流程
+    }
+  }
+
+  /** 上传成功后清除缓存 */
+  private clearPendingReadings(): void {
+    try {
+      Taro.removeStorageSync(CACHE_KEY);
+    } catch {
+      // 忽略
+    }
+  }
+
+  /** 启动时检查缓存，有未上传数据则自动重传。
+   *  返回重传的记录数 */
+  async flushPendingReadings(
+    uploadFn: (readings: NormalizedReading[]) => Promise<number>,
+  ): Promise<number> {
+    try {
+      const raw = Taro.getStorageSync(CACHE_KEY) as string;
+      if (!raw) return 0;
+      const cached: NormalizedReading[] = JSON.parse(raw);
+      if (!Array.isArray(cached) || cached.length === 0) {
+        Taro.removeStorageSync(CACHE_KEY);
+        return 0;
+      }
+
+      const batch = cached.slice(0, this.config.maxReadingsPerSync);
+      const uploaded = await uploadFn(batch);
+      Taro.removeStorageSync(CACHE_KEY);
+      return uploaded;
+    } catch {
+      return 0;
+    }
+  }
 }
 
 export default new BLEManager();