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/home/widgets/chat_messages_view.dart

@@ -1,14 +1,17 @@
 import 'dart:io';
 import 'package:flutter/material.dart';
-import 'package:flutter_markdown/flutter_markdown.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:shadcn_ui/shadcn_ui.dart';
 import '../../../core/app_colors.dart';
+import '../../../core/app_design_tokens.dart';
+import '../../../core/app_module_visuals.dart';
 import '../../../core/app_theme.dart';
 import '../../../core/api_client.dart' show baseUrl;
 import '../../../core/navigation_provider.dart';
 import '../../../providers/chat_provider.dart';
 import '../../../providers/data_providers.dart';
+import '../../../widgets/ai_content.dart';
+import '../../../widgets/app_toast.dart';
 
 /// 卡片入场动画包装（从下往上滑入 + 淡入）
 class _AnimatedCardEntry extends StatefulWidget {
@@ -260,20 +263,15 @@ class ChatMessagesView extends ConsumerWidget {
                               const SizedBox(height: 9),
                               Text(
                                 info.$2,
-                                style: const TextStyle(
-                                  fontSize: 24,
-                                  fontWeight: FontWeight.w800,
-                                  color: AppColors.textPrimary,
-                                ),
+                              style: AppTextStyles.chatTitle.copyWith(
+                                fontSize: 22,
+                                fontWeight: FontWeight.w900,
+                              ),
                               ),
                               const SizedBox(height: 8),
                               Text(
                                 info.$3,
-                                style: const TextStyle(
-                                  fontSize: 16,
-                                  color: AppColors.textSecondary,
-                                  height: 1.4,
-                                ),
+                                style: AppTextStyles.summarySubtitle,
                               ),
                             ],
                           ),
@@ -514,7 +512,7 @@ class ChatMessagesView extends ConsumerWidget {
     } else if (isExercise) {
       // 运动计划 — 主展示区大号显示运动名，字段列时长/频率/天数
       title = '运动计划确认';
-      titleIcon = Icons.directions_run_outlined;
+      titleIcon = LucideIcons.footprints;
       final exName =
           (meta['value'] ??
                   meta['name'] ??
@@ -706,7 +704,7 @@ class ChatMessagesView extends ConsumerWidget {
                                 : Icon(
                                     isMedication
                                         ? Icons.medication_liquid_outlined
-                                        : Icons.directions_run_outlined,
+                                        : LucideIcons.footprints,
                                     size: 36,
                                     color: AppColors.iconColor,
                                   ),
@@ -895,9 +893,11 @@ class ChatMessagesView extends ConsumerWidget {
                                   .read(chatProvider.notifier)
                                   .confirmMessage(msg.id);
                               if (error != null && context.mounted) {
-                                ScaffoldMessenger.of(
+                                AppToast.show(
                                   context,
-                                ).showSnackBar(SnackBar(content: Text(error)));
+                                  error,
+                                  type: AppToastType.error,
+                                );
                               }
                             },
                             borderRadius: BorderRadius.circular(18),
@@ -1098,63 +1098,13 @@ class ChatMessagesView extends ConsumerWidget {
               if (isUser)
                 SelectableText(
                   msg.content,
-                  style: const TextStyle(
-                    fontSize: 19,
-                    color: Colors.white,
-                    height: 1.5,
-                  ),
+                  style: AppTextStyles.chatBody.copyWith(color: Colors.white),
                 )
               else
-                MarkdownBody(
-                  data: _cleanAiText(msg.content),
-                  selectable: true,
+                AiMarkdownView(
+                  data: msg.content,
                   onTapLink: (text, href, title) =>
                       _handleMarkdownLink(context, ref, href),
-                  styleSheet: MarkdownStyleSheet(
-                    p: const TextStyle(
-                      fontSize: 19,
-                      color: AppColors.textPrimary,
-                      height: 1.5,
-                    ),
-                    a: const TextStyle(
-                      fontSize: 19,
-                      color: AppColors.primary,
-                      fontWeight: FontWeight.w700,
-                      decoration: TextDecoration.underline,
-                      decorationColor: AppColors.primary,
-                    ),
-                    strong: const TextStyle(
-                      fontSize: 19,
-                      color: AppColors.textPrimary,
-                      height: 1.5,
-                      fontWeight: FontWeight.w700,
-                    ),
-                    h1: const TextStyle(
-                      fontSize: 22,
-                      color: AppColors.textPrimary,
-                      height: 1.35,
-                      fontWeight: FontWeight.w800,
-                    ),
-                    h2: const TextStyle(
-                      fontSize: 21,
-                      color: AppColors.textPrimary,
-                      height: 1.4,
-                      fontWeight: FontWeight.w800,
-                    ),
-                    h3: const TextStyle(
-                      fontSize: 20,
-                      color: AppColors.textPrimary,
-                      height: 1.4,
-                      fontWeight: FontWeight.w800,
-                    ),
-                    listBullet: const TextStyle(
-                      fontSize: 24,
-                      color: AppColors.textPrimary,
-                      height: 1.2,
-                      fontWeight: FontWeight.w900,
-                    ),
-                    listBulletPadding: const EdgeInsets.only(right: 8),
-                  ),
                 ),
 
               // 图片缩略图（在文字下方）
@@ -1321,6 +1271,7 @@ class ChatMessagesView extends ConsumerWidget {
   }
 
   /// 清理 AI 返回文本中的异常占位符（Markdown 格式交给 MarkdownBody 渲染）
+  // ignore: unused_element
   static String _cleanAiText(String text) {
     var t = text;
     // 移除 $1、$2 等占位符
@@ -1449,7 +1400,21 @@ class ChatMessagesView extends ConsumerWidget {
   }
 
   static _AgentColors _agentColors(ActiveAgent agent) {
+    _AgentColors fromModule(AppModuleVisual visual) => _AgentColors(
+      gradient: [visual.gradient.colors.first, visual.gradient.colors.last],
+      bg: visual.lightColor,
+      border: visual.borderColor,
+      iconBg: visual.lightColor,
+      accent: visual.color,
+      verticalGradient: true,
+    );
+
     return switch (agent) {
+      ActiveAgent.health => fromModule(AppModuleVisuals.health),
+      ActiveAgent.diet => fromModule(AppModuleVisuals.diet),
+      ActiveAgent.medication => fromModule(AppModuleVisuals.medication),
+      ActiveAgent.report => fromModule(AppModuleVisuals.report),
+      ActiveAgent.exercise => fromModule(AppModuleVisuals.exercise),
       ActiveAgent.consultation => _AgentColors(
         gradient: [Color(0xFFFFCAD4), Color(0xFFFF9AAE)],
         bg: const Color(0xFFFFF4F6),
@@ -1458,46 +1423,6 @@ class ChatMessagesView extends ConsumerWidget {
         accent: const Color(0xFFFF7F98),
         verticalGradient: true,
       ),
-      ActiveAgent.health => _AgentColors(
-        gradient: [Color(0xFFA1FFCE), Color(0xFF69DB8F)],
-        bg: const Color(0xFFF4FEF2),
-        border: const Color(0xFFD4F0C8),
-        iconBg: const Color(0xFFF0FCEF),
-        accent: const Color(0xFF52B87A),
-        verticalGradient: true,
-      ),
-      ActiveAgent.diet => _AgentColors(
-        gradient: [Color(0xFFF6D365), Color(0xFFFDA085)],
-        bg: const Color(0xFFFFF7F0),
-        border: const Color(0xFFFFE8D4),
-        iconBg: const Color(0xFFFFF0E4),
-        accent: const Color(0xFFF89C5B),
-        verticalGradient: true,
-      ),
-      ActiveAgent.medication => _AgentColors(
-        gradient: [Color(0xFF89F7FE), Color(0xFF66A6FF)],
-        bg: const Color(0xFFF4F6FF),
-        border: const Color(0xFFDDE6FF),
-        iconBg: const Color(0xFFEFF3FF),
-        accent: const Color(0xFF4F8FF7),
-        verticalGradient: true,
-      ),
-      ActiveAgent.report => _AgentColors(
-        gradient: [Color(0xFFE0C3FC), Color(0xFF8EC5FC)],
-        bg: const Color(0xFFF8F5FF),
-        border: const Color(0xFFE9E0FF),
-        iconBg: const Color(0xFFF2EDFF),
-        accent: const Color(0xFF9D8AF8),
-        verticalGradient: true,
-      ),
-      ActiveAgent.exercise => _AgentColors(
-        gradient: [Color(0xFFB6F2FF), Color(0xFF7DD3FC)],
-        bg: const Color(0xFFF0FCFF),
-        border: const Color(0xFFD8F5FC),
-        iconBg: const Color(0xFFEAFBFF),
-        accent: const Color(0xFF38BDE8),
-        verticalGradient: true,
-      ),
       _ => _AgentColors(
         gradient: [AppColors.primary, AppColors.blueMeasure],
         bg: const Color(0xFFF6F3FF),
@@ -1519,7 +1444,7 @@ class ChatMessagesView extends ConsumerWidget {
         'AI智能问诊，描述症状获取建议',
       ),
       ActiveAgent.report => (LucideIcons.fileText, '报告分析', '上传体检报告，AI 辅助解读'),
-      ActiveAgent.exercise => (LucideIcons.activity, '运动', '制定运动计划，打卡记录进度'),
+      ActiveAgent.exercise => (LucideIcons.footprints, '运动', '制定运动计划，打卡记录进度'),
       _ => (Icons.forum_outlined, 'AI 助手', '血管病患者的 AI 健康管理助手'),
     };
   }
@@ -1621,8 +1546,8 @@ class ChatMessagesView extends ConsumerWidget {
 
     // ── 1. 健康指标 ──
     // 没记录则整行不显示（避免每天唠叨提醒）
-    const healthIconColor = Color(0xFF3B82F6);
-    const healthIconBg = Color(0xFFDBEAFE);
+    final healthIconColor = AppModuleVisuals.health.color;
+    final healthIconBg = AppModuleVisuals.health.lightColor;
     if (allNull) {
       // 不显示
     } else if (hasAbnormal) {
@@ -1632,7 +1557,7 @@ class ChatMessagesView extends ConsumerWidget {
       tasks.add(
         _taskRow(
           context,
-          Icons.warning_amber_rounded,
+          LucideIcons.triangleAlert,
           '健康指标',
           trailing: trailing,
           status: 'warning',
@@ -1646,7 +1571,7 @@ class ChatMessagesView extends ConsumerWidget {
       tasks.add(
         _taskRow(
           context,
-          Icons.check_circle,
+          LucideIcons.circleCheck,
           '健康指标',
           trailing: '指标正常',
           status: 'done',
@@ -1658,8 +1583,8 @@ class ChatMessagesView extends ConsumerWidget {
     }
 
     // ── 2. 运动 ──
-    const exIconColor = Color(0xFFF59E0B);
-    const exIconBg = Color(0xFFFEF3C7);
+    final exIconColor = AppModuleVisuals.exercise.color;
+    final exIconBg = AppModuleVisuals.exercise.lightColor;
     final exercisePlan = ref.watch(currentExercisePlanProvider);
     var hasExercise = false;
     exercisePlan.when(
@@ -1685,7 +1610,7 @@ class ChatMessagesView extends ConsumerWidget {
             tasks.add(
               _taskRow(
                 context,
-                Icons.directions_run,
+                LucideIcons.footprints,
                 '$name $dur分钟',
                 status: done
                     ? 'done'
@@ -1703,7 +1628,7 @@ class ChatMessagesView extends ConsumerWidget {
         tasks.add(
           _taskRow(
             context,
-            Icons.directions_run,
+            LucideIcons.footprints,
             '运动',
             trailing: '正在加载运动计划',
             status: 'pending',
@@ -1718,7 +1643,7 @@ class ChatMessagesView extends ConsumerWidget {
         tasks.add(
           _taskRow(
             context,
-            Icons.directions_run,
+            LucideIcons.footprints,
             '运动',
             trailing: '运动计划加载失败',
             status: 'overdue',
@@ -1733,7 +1658,7 @@ class ChatMessagesView extends ConsumerWidget {
       tasks.add(
         _taskRow(
           context,
-          Icons.directions_run,
+          LucideIcons.footprints,
           '运动',
           trailing: '暂无今日运动计划',
           status: 'pending',
@@ -1746,8 +1671,8 @@ class ChatMessagesView extends ConsumerWidget {
 
     // ── 3. 用药打卡 ──
     // 漏服时突出提醒；未到服药时间时也保留一行轻提示，避免今日健康缺少用药状态。
-    const medIconColor = Color(0xFFEC4899);
-    const medIconBg = Color(0xFFFCE7F3);
+    final medIconColor = AppModuleVisuals.medication.color;
+    final medIconBg = AppModuleVisuals.medication.lightColor;
     reminders.whenOrNull(
       data: (meds) {
         final overdueMeds = meds
@@ -1757,7 +1682,7 @@ class ChatMessagesView extends ConsumerWidget {
           tasks.add(
             _taskRow(
               context,
-              Icons.medication_rounded,
+              LucideIcons.pill,
               '用药',
               trailing: meds.isEmpty ? '暂无用药安排' : '暂时不用吃药',
               status: 'done',
@@ -1815,7 +1740,7 @@ class ChatMessagesView extends ConsumerWidget {
         tasks.add(
           _taskRow(
             context,
-            Icons.medication_rounded,
+            LucideIcons.pill,
             title,
             trailing: trailing,
             status: status,