fix(device): 扫描前检查系统蓝牙/定位开关，定位关闭时主动提示

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

miniprogram/pages/connectedDevice/connectedDevice.ts

@@ -131,18 +131,53 @@ Page({
         connectCleanup = null
     },
 
-    /** 申请位置权限后打开蓝牙适配器（蓝牙权限由 openBluetoothAdapter 自动触发） */
-    async _requestPermissionAndScan() {
+    /** 检查系统蓝牙开关 */
+    _checkBluetoothEnabled(): boolean {
+        try {
+            if (wx.getSystemSetting().bluetoothEnabled === false) {
+                this._showBluetoothOff()
+                return false
+            }
+            return true
+        } catch {
+            // 基础库不支持 wx.getSystemSetting 时跳过，交由 openBluetoothAdapter 报错兜底
+            return true
+        }
+    },
+
+    /** 检查系统定位开关 */
+    _checkLocationService(): boolean {
+        try {
+            if (wx.getSystemSetting().locationEnabled === false) {
+                this._showLocationOff()
+                return false
+            }
+            return true
+        } catch {
+            return true
+        }
+    },
+
+    /** 申请微信“附近设备/位置”授权 */
+    async _ensureLocationAuth(): Promise<boolean> {
         try {
             const { authSetting } = await wx.getSetting()
             const setting = authSetting as Record<string, boolean | undefined>
             if (!setting['scope.userLocation']) {
                 await wx.authorize({ scope: 'scope.userLocation' })
             }
+            return true
         } catch {
             this._showLocationGuide()
-            return
+            return false
         }
+    },
+
+    /** 编排：蓝牙开关 → 定位开关 → 微信授权 → 打开蓝牙并扫描 */
+    async _requestPermissionAndScan() {
+        if (!this._checkBluetoothEnabled()) return
+        if (!this._checkLocationService()) return
+        if (!(await this._ensureLocationAuth())) return
         await this._openAdapterAndScan()
     },
 
@@ -280,6 +315,7 @@ Page({
             content: '安卓手机搜索蓝牙设备需开启定位服务，请前往系统设置开启后重试。',
             showCancel: false,
             confirmText: '知道了',
+            success: () => this.setData({ status: 'idle' }),
         })
     },