feat(mp): BLE 血氧仪支持 + 服务发现增强

- 新增 Pulse Oximeter Service (0x1822) 支持，含 SFLOAT 解析
- 连接后自动扫描全部服务，发现并订阅已知健康 UUID
- 设备同步页展示已发现的服务和可用数据类型标签
- 新增 BLEDiscoveredService / BLEDiscoveredCharacteristic 类型

apps/miniprogram/src/services/ble/adapters/GenericBleAdapter.ts

@@ -23,8 +23,44 @@ const SERVICES: Record<string, { uuid: string; chars: { notify: string; read: st
       read: '00002A35-0000-1000-8000-00805F9B34FB',
     },
   },
+  pulse_oximeter: {
+    uuid: '00001822-0000-1000-8000-00805F9B34FB',
+    chars: {
+      // PLX Continuous Measurement — 实时血氧+脉率
+      notify: '00002A5F-0000-1000-8000-00805F9B34FB',
+      // PLX Spot-Check Measurement — 单次测量
+      read: '00002A5E-0000-1000-8000-00805F9B34FB',
+    },
+  },
 };
 
+// ── IEEE 11073 SFLOAT 解析（Bluetooth SIG 医疗 Profile 通用格式） ──
+
+/** 特殊 SFLOAT 值 */
+const SFLOAT_NAN = 0x07FF;
+const SFLOAT_NRES = 0x0800;
+const SFLOAT_POS_INF = 0x07FE;
+const SFLOAT_NEG_INF = 0x0802;
+
+function parseSFLOAT(view: DataView, offset: number): number | null {
+  if (offset + 2 > view.byteLength) return null;
+  const raw = view.getUint16(offset, true);
+
+  if (raw === SFLOAT_NAN || raw === SFLOAT_NRES) return null;
+  if (raw === SFLOAT_POS_INF) return Infinity;
+  if (raw === SFLOAT_NEG_INF) return -Infinity;
+
+  const signM = (raw >> 15) & 0x01;
+  const exp = (raw >> 12) & 0x07;
+  const mantissa = raw & 0x0FFF;
+
+  // 指数用 3 位补码表示（0-3 正，4-7 负）
+  const exponent = exp >= 4 ? exp - 8 : exp;
+  const signedMantissa = signM ? -(mantissa ^ 0x0FFF) - 1 : mantissa;
+
+  return signedMantissa * Math.pow(10, exponent);
+}
+
 // ── 解析器 ──
 
 function parseHeartRate(data: ArrayBuffer): NormalizedReading | null {
@@ -66,6 +102,39 @@ function parseTemperature(data: ArrayBuffer): NormalizedReading | null {
   };
 }
 
+/**
+ * 解析 Pulse Oximeter Service 数据
+ * PLX Continuous Measurement (0x2A5F) 和 Spot-Check (0x2A5E) 共用
+ * 格式: Flags(1B) + SpO2(SFLOAT 2B) + PulseRate(SFLOAT 2B) + optional...
+ */
+function parsePulseOximeter(data: ArrayBuffer): NormalizedReading[] {
+  const view = new DataView(data);
+  if (view.byteLength < 5) return [];
+
+  const spO2 = parseSFLOAT(view, 1);
+  const pulseRate = parseSFLOAT(view, 3);
+  const now = new Date().toISOString();
+  const results: NormalizedReading[] = [];
+
+  if (spO2 !== null && spO2 >= 0 && spO2 <= 100) {
+    results.push({
+      device_type: 'blood_oxygen',
+      values: { blood_oxygen: Math.round(spO2), unit: '%' },
+      measured_at: now,
+    });
+  }
+
+  if (pulseRate !== null && pulseRate > 0 && pulseRate <= 300) {
+    results.push({
+      device_type: 'heart_rate',
+      values: { heart_rate: Math.round(pulseRate) },
+      measured_at: now,
+    });
+  }
+
+  return results;
+}
+
 // ── 工厂函数 ──
 
 export interface GenericAdapterConfig {
@@ -100,20 +169,23 @@ export function createGenericBleAdapter(config: GenericAdapterConfig): DeviceAda
     ): NormalizedReading[] {
       const upper = charUUID.toUpperCase();
 
-      // Heart Rate Measurement
-      const hrsChar = SERVICES.heart_rate.chars.notify.toUpperCase();
-      if (upper === hrsChar || upper.includes('2A37')) {
+      // Heart Rate Measurement (0x2A37)
+      if (upper.includes('2A37')) {
         const result = parseHeartRate(data);
         return result ? [result] : [];
       }
 
-      // Temperature Measurement
-      const htChar = SERVICES.health_thermometer.chars.notify.toUpperCase();
-      if (upper === htChar || upper.includes('2A1C')) {
+      // Temperature Measurement (0x2A1C)
+      if (upper.includes('2A1C')) {
         const result = parseTemperature(data);
         return result ? [result] : [];
       }
 
+      // Pulse Oximeter Continuous (0x2A5F) / Spot-Check (0x2A5E)
+      if (upper.includes('2A5F') || upper.includes('2A5E')) {
+        return parsePulseOximeter(data);
+      }
+
       return [];
     },
 
@@ -155,7 +227,7 @@ export const HuaweiBandAdapter = createGenericBleAdapter({
     '华为手环',
     '华为手表',
   ],
-  profiles: ['heart_rate', 'health_thermometer'],
+  profiles: ['heart_rate', 'health_thermometer', 'pulse_oximeter'],
 });
 
 /**