feat: UI 系统中心化 + 趋势图重构 + 法律文档 H5 上线

- UI 系统: 新增 design_tokens / module_visuals / app_buttons / app_status_badge / app_toast / ai_content 六个共享模块; 28 个页面接入, SnackBar 全部替换为 AppToast
- 趋势图: 直线折线 + 渐变填充 + 阴影; 去网格线; X 轴日+月份分隔; Y 轴整数刻度最多 4 个; 点击数据点/录入记录显示上方浮层, 选中点变实心
- 法律文档 H5: 后端 wwwroot 托管隐私政策/服务协议/关于/个人信息收集清单/第三方 SDK 清单 + 索引页; Program.cs 启用 UseDefaultFiles + UseStaticFiles
- 其他: auth_provider 登录流程调整; api_client IP 适配; 主页智能体栏间距优化

health_app/lib/pages/device/device_management_page.dart

@@ -7,6 +7,7 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:permission_handler/permission_handler.dart';
 
 import '../../core/app_colors.dart';
+import '../../core/app_module_visuals.dart';
 import '../../core/app_theme.dart';
 import '../../core/navigation_provider.dart';
 import '../../models/ble_device.dart';
@@ -15,6 +16,9 @@ import '../../providers/auth_provider.dart';
 import '../../providers/omron_device_provider.dart';
 import '../../services/health_ble_service.dart';
 import '../../widgets/ble_sync_dialog.dart';
+import '../../widgets/app_toast.dart';
+
+const _deviceVisual = AppModuleVisuals.device;
 
 class DeviceManagementPage extends ConsumerStatefulWidget {
   const DeviceManagementPage({super.key});
@@ -39,6 +43,7 @@ class _DeviceManagementPageState extends ConsumerState<DeviceManagementPage>
   DateTime? _scanStartedAt;
   String _activeScanBoundKey = '';
   bool _scanning = false;
+  bool _permissionBlocked = false;
   bool _disposed = false;
 
   @override
@@ -66,18 +71,20 @@ class _DeviceManagementPageState extends ConsumerState<DeviceManagementPage>
   }
 
   Future<void> _startForegroundScan() async {
-    await [Permission.bluetoothScan, Permission.bluetoothConnect].request();
+    if (!await _ensureBlePermissions()) {
+      if (mounted) setState(() => _scanning = false);
+      return;
+    }
     if (_disposed || !mounted) return;
 
     if (Platform.isAndroid) {
       final locStatus = await Permission.locationWhenInUse.serviceStatus;
       if (_disposed || !mounted) return;
       if (locStatus != ServiceStatus.enabled && mounted) {
-        ScaffoldMessenger.of(context).showSnackBar(
-          const SnackBar(
-            content: Text('请先打开定位服务，否则可能无法发现蓝牙设备'),
-            backgroundColor: AppColors.warning,
-          ),
+        AppToast.show(
+          context,
+          '请先打开定位服务，否则可能无法发现蓝牙设备',
+          type: AppToastType.warning,
         );
       }
     }
@@ -120,6 +127,42 @@ class _DeviceManagementPageState extends ConsumerState<DeviceManagementPage>
     }
   }
 
+  Future<bool> _ensureBlePermissions() async {
+    final statuses = await [
+      Permission.bluetoothScan,
+      Permission.bluetoothConnect,
+    ].request();
+    final granted = statuses.values.every((status) => status.isGranted);
+    if (granted) {
+      _permissionBlocked = false;
+      return true;
+    }
+    _permissionBlocked = true;
+    if (_disposed || !mounted) return false;
+    AppToast.show(context, '请开启蓝牙权限后再同步设备', type: AppToastType.warning);
+    await showDialog<void>(
+      context: context,
+      builder: (ctx) => AlertDialog(
+        title: const Text('需要蓝牙权限'),
+        content: const Text('同步已绑定设备需要蓝牙权限，请在系统设置中开启后重试。'),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.pop(ctx),
+            child: const Text('稍后再说'),
+          ),
+          TextButton(
+            onPressed: () {
+              Navigator.pop(ctx);
+              openAppSettings();
+            },
+            child: const Text('去设置'),
+          ),
+        ],
+      ),
+    );
+    return false;
+  }
+
   void _onScanResults(List<ScanResult> results) {
     if (!mounted || _busyDeviceId != null) return;
     final scanStartedAt = _scanStartedAt;
@@ -213,21 +256,11 @@ class _DeviceManagementPageState extends ConsumerState<DeviceManagementPage>
       }
     } on TimeoutException {
       if (!_disposed && mounted && _connectedDeviceId == bound.id) {
-        ScaffoldMessenger.of(context).showSnackBar(
-          const SnackBar(
-            content: Text('已连接设备，但本次未收到测量数据'),
-            backgroundColor: AppColors.warning,
-          ),
-        );
+        AppToast.show(context, '已连接设备，但本次未收到测量数据', type: AppToastType.warning);
       }
     } on Exception {
       if (!_disposed && mounted) {
-        ScaffoldMessenger.of(context).showSnackBar(
-          const SnackBar(
-            content: Text('数据录入失败，请稍后重试'),
-            backgroundColor: AppColors.error,
-          ),
-        );
+        AppToast.show(context, '数据录入失败，请稍后重试', type: AppToastType.error);
       }
     } finally {
       await _bleService.disconnect();
@@ -272,6 +305,7 @@ class _DeviceManagementPageState extends ConsumerState<DeviceManagementPage>
     if (devices.isNotEmpty &&
         !_scanning &&
         _busyDeviceId == null &&
+        !_permissionBlocked &&
         _activeScanBoundKey != boundKey) {
       WidgetsBinding.instance.addPostFrameCallback((_) {
         if (!_disposed && mounted) unawaited(_startForegroundScan());
@@ -288,6 +322,7 @@ class _DeviceManagementPageState extends ConsumerState<DeviceManagementPage>
         return;
       }
       if (nextKey != _activeScanBoundKey && _busyDeviceId == null) {
+        if (_permissionBlocked) return;
         WidgetsBinding.instance.addPostFrameCallback((_) {
           if (!_disposed && mounted) unawaited(_startForegroundScan());
         });
@@ -308,8 +343,8 @@ class _DeviceManagementPageState extends ConsumerState<DeviceManagementPage>
               tooltip: '新增设备',
               onPressed: () => pushRoute(ref, 'deviceScan'),
               style: IconButton.styleFrom(
-                backgroundColor: const Color(0xFFEFF6FF),
-                foregroundColor: const Color(0xFF2563EB),
+                backgroundColor: _deviceVisual.lightColor,
+                foregroundColor: _deviceVisual.color,
                 fixedSize: const Size(40, 40),
               ),
               icon: const Icon(Icons.add_rounded),
@@ -402,11 +437,7 @@ class _DevicesHeader extends StatelessWidget {
             width: 50,
             height: 50,
             decoration: BoxDecoration(
-              gradient: const LinearGradient(
-                begin: Alignment.topLeft,
-                end: Alignment.bottomRight,
-                colors: [Color(0xFF60A5FA), Color(0xFF8B5CF6)],
-              ),
+              gradient: _deviceVisual.gradient,
               borderRadius: BorderRadius.circular(16),
             ),
             child: const Icon(
@@ -474,15 +505,11 @@ class _DeviceSection extends StatelessWidget {
                 width: 34,
                 height: 34,
                 decoration: BoxDecoration(
-                  color: const Color(0xFFEFF6FF),
+                  color: _deviceVisual.lightColor,
                   borderRadius: BorderRadius.circular(11),
                   border: Border.all(color: AppColors.borderLight),
                 ),
-                child: Icon(
-                  type.icon,
-                  size: 19,
-                  color: const Color(0xFF2563EB),
-                ),
+                child: Icon(type.icon, size: 19, color: _deviceVisual.color),
               ),
               const SizedBox(width: 10),
               Text(