refactor: 重构蓝牙设备页与新增设备页的扫描-连接-录入流程

- 通用 BLE 健康设备识别（血压计/血糖仪/体重秤/血氧仪 标准 service UUID）
- 蓝牙设备页静默自动同步：仅匹配已绑定的设备名+类型，收到数据后变绿
- 新增设备页：扫描所有支持类型设备 → 选连接 → 绑定 + 同步首次数据
- 修复 read 缓存导致的重复录入循环（删除主动 read，依赖 indicate 推送）
- 修复 isConnected 缓存状态导致连接异常（强制先 disconnect 再 connect）
- 录入弹窗：血压心率同等级展示、3 秒自动关闭/手动确认
- 顺手更新本机开发 IP 与清理过时设计文档

health_app/lib/widgets/ble_sync_dialog.dart

@@ -0,0 +1,160 @@
+import 'package:flutter/material.dart';
+
+import '../core/app_colors.dart';
+import '../models/bp_reading.dart';
+
+Future<void> showBleSyncDialog(
+  BuildContext context, {
+  required BpReading reading,
+}) {
+  return showDialog<void>(
+    context: context,
+    barrierDismissible: false,
+    barrierColor: Colors.black.withValues(alpha: 0.54),
+    builder: (ctx) => Dialog(
+      insetPadding: const EdgeInsets.symmetric(horizontal: 28),
+      backgroundColor: Colors.transparent,
+      child: Container(
+        width: double.infinity,
+        constraints: const BoxConstraints(maxWidth: 380),
+        padding: const EdgeInsets.fromLTRB(22, 28, 22, 22),
+        decoration: BoxDecoration(
+          color: Colors.white,
+          borderRadius: BorderRadius.circular(28),
+          boxShadow: [
+            BoxShadow(
+              color: Colors.black.withValues(alpha: 0.14),
+              blurRadius: 34,
+              offset: const Offset(0, 18),
+            ),
+          ],
+        ),
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            const Text(
+              '数据已录入',
+              textAlign: TextAlign.center,
+              style: TextStyle(
+                fontSize: 22,
+                fontWeight: FontWeight.w900,
+                color: AppColors.textPrimary,
+              ),
+            ),
+            const SizedBox(height: 24),
+            Row(
+              children: [
+                Expanded(
+                  child: _MetricCard(
+                    label: '收缩压',
+                    value: '${reading.systolic}',
+                    unit: 'mmHg',
+                  ),
+                ),
+                const SizedBox(width: 16),
+                Expanded(
+                  child: _MetricCard(
+                    label: '舒张压',
+                    value: '${reading.diastolic}',
+                    unit: 'mmHg',
+                  ),
+                ),
+              ],
+            ),
+            if (reading.pulse != null) ...[
+              const SizedBox(height: 16),
+              Row(
+                children: [
+                  Expanded(
+                    child: _MetricCard(
+                      label: '脉搏',
+                      value: '${reading.pulse}',
+                      unit: 'bpm',
+                    ),
+                  ),
+                  const Expanded(child: SizedBox.shrink()),
+                ],
+              ),
+            ],
+            const SizedBox(height: 28),
+            GestureDetector(
+              onTap: () => Navigator.pop(ctx),
+              child: Container(
+                height: 50,
+                width: double.infinity,
+                alignment: Alignment.center,
+                decoration: BoxDecoration(
+                  gradient: AppColors.doctorGradient,
+                  borderRadius: BorderRadius.circular(18),
+                  boxShadow: AppColors.buttonShadow,
+                ),
+                child: const Text(
+                  '知道了',
+                  style: TextStyle(
+                    color: Colors.white,
+                    fontSize: 16,
+                    fontWeight: FontWeight.w900,
+                  ),
+                ),
+              ),
+            ),
+          ],
+        ),
+      ),
+    ),
+  );
+}
+
+class _MetricCard extends StatelessWidget {
+  final String label;
+  final String value;
+  final String unit;
+
+  const _MetricCard({
+    required this.label,
+    required this.value,
+    required this.unit,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      padding: const EdgeInsets.symmetric(vertical: 16),
+      decoration: BoxDecoration(
+        color: const Color(0xFFF8FAFC),
+        borderRadius: BorderRadius.circular(14),
+      ),
+      child: Column(
+        children: [
+          Text(
+            value,
+            style: const TextStyle(
+              fontSize: 36,
+              fontWeight: FontWeight.w900,
+              color: AppColors.textPrimary,
+              height: 1,
+            ),
+          ),
+          const SizedBox(height: 6),
+          Text(
+            unit,
+            style: const TextStyle(
+              fontSize: 13,
+              fontWeight: FontWeight.w700,
+              color: AppColors.textHint,
+            ),
+          ),
+          const SizedBox(height: 4),
+          Text(
+            label,
+            style: const TextStyle(
+              fontSize: 13,
+              fontWeight: FontWeight.w700,
+              color: AppColors.textSecondary,
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}