refactor: 死代码清理 + 趋势图重构 + 侧边栏交互优化 + 智能体卡片去延迟

- 死代码清理: 删除 AppCard/AppMenuItem/AppTabChip/AppButtons 等 4 个未使用 Widget 文件; 清理 common_widgets/enterprise_widgets/app_status_badge 中未使用 class; 移除 HealthService 等未使用方法; 后端移除 ExerciseService.CreateFromItemsAsync/HealthArchiveService.GetOrCreateAsync/MedicationAgentHandler 死分支/ChatRequest DTO
- 趋势图: 直线折线 + 渐变填充 + 阴影; 去网格; X 轴日+月份; 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
- 侧边栏: 对话记录改单选删除(灰底高亮); 操作栏浮层修复触摸问题; 常用功能/健康仪表盘间距收紧; _Panel 去外框
- 智能体: 欢迎卡片去掉 400ms 延迟; 胶囊去阴影
- 其他: api_client IP 适配; 多页面 UI 微调; 新增 chat_provider/prelaunch_guardrails 测试

health_app/lib/pages/home/widgets/chat_messages_view.dart

@@ -859,13 +859,13 @@ class ChatMessagesView extends ConsumerWidget {
                       ),
                     ],
                   ),
-                  child: msg.confirmed
+                  child: msg.confirmed || msg.isReadOnly
                       ? Container(
                           decoration: BoxDecoration(
                             gradient: AppColors.successButtonGradient,
                             borderRadius: BorderRadius.circular(18),
                           ),
-                          child: const Row(
+                          child: Row(
                             mainAxisAlignment: MainAxisAlignment.center,
                             children: [
                               Icon(
@@ -873,10 +873,10 @@ class ChatMessagesView extends ConsumerWidget {
                                 size: 22,
                                 color: Colors.white,
                               ),
-                              SizedBox(width: 8),
+                              const SizedBox(width: 8),
                               Text(
-                                '录入成功',
-                                style: TextStyle(
+                                msg.isReadOnly ? '历史记录' : '录入成功',
+                                style: const TextStyle(
                                   fontSize: 19,
                                   fontWeight: FontWeight.w700,
                                   color: Colors.white,
@@ -1236,9 +1236,7 @@ class ChatMessagesView extends ConsumerWidget {
             ClipRRect(
               borderRadius: BorderRadius.circular(12),
               child: InteractiveViewer(
-                child: path.startsWith('http')
-                    ? Image.network(resolvedPath, fit: BoxFit.contain)
-                    : resolvedPath.startsWith('http')
+                child: resolvedPath.startsWith('http')
                     ? Image.network(resolvedPath, fit: BoxFit.contain)
                     : Image.file(File(resolvedPath), fit: BoxFit.contain),
               ),
@@ -1270,20 +1268,6 @@ class ChatMessagesView extends ConsumerWidget {
     return path;
   }
 
-  /// 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
-    t = t.replaceAll(RegExp(r'\$\d+'), '');
-    // 移除残留 HTML 标签
-    t = t.replaceAll(RegExp(r'<[^>]+>'), '');
-    // 行首 # 超过 3 个降为 ###
-    t = t.replaceAllMapped(RegExp(r'^#{4,}\s', multiLine: true), (_) => '### ');
-    // 压缩多余空行
-    t = t.replaceAll(RegExp(r'\n{3,}'), '\n\n');
-    return t.trim();
-  }
 
   /// 处理 AI 回复里的 markdown 链接点击：
   /// - app://diet → 触发拍照/相册选择，跳到饮食拍照流程
@@ -2098,77 +2082,3 @@ extension _AgentActionsExt on ActiveAgent {
       _agentActions[this] ??
       [const _AgentAction(label: '开始对话', icon: Icons.chat_outlined)];
 }
-
-// ════════════════════════════════════════════════════════════════
-// 可展开的 AI 建议小组件
-// ════════════════════════════════════════════════════════════════
-
-class _ExpandableAdvice extends StatefulWidget {
-  final String advice;
-  const _ExpandableAdvice({required this.advice});
-
-  @override
-  State<_ExpandableAdvice> createState() => _ExpandableAdviceState();
-}
-
-class _ExpandableAdviceState extends State<_ExpandableAdvice> {
-  bool _expanded = false;
-
-  @override
-  Widget build(BuildContext context) {
-    return GestureDetector(
-      onTap: () => setState(() => _expanded = !_expanded),
-      child: Container(
-        width: double.infinity,
-        padding: const EdgeInsets.all(14),
-        decoration: BoxDecoration(
-          color: AppColors.backgroundSecondary,
-          borderRadius: BorderRadius.circular(12),
-          border: Border.all(color: const Color(0xFFE8E4FF), width: 0.8),
-        ),
-        child: Column(
-          crossAxisAlignment: CrossAxisAlignment.start,
-          children: [
-            Row(
-              children: [
-                const Icon(
-                  Icons.lightbulb_outline,
-                  size: 19,
-                  color: AppTheme.primary,
-                ),
-                const SizedBox(width: 6),
-                const Text(
-                  'AI 建议',
-                  style: TextStyle(
-                    fontSize: 16,
-                    fontWeight: FontWeight.w600,
-                    color: AppTheme.primary,
-                  ),
-                ),
-                const Spacer(),
-                Icon(
-                  _expanded
-                      ? Icons.keyboard_arrow_up
-                      : Icons.keyboard_arrow_down,
-                  size: 21,
-                  color: AppColors.textHint,
-                ),
-              ],
-            ),
-            if (_expanded) ...[
-              const SizedBox(height: 10),
-              Text(
-                widget.advice,
-                style: const TextStyle(
-                  fontSize: 16,
-                  color: Color(0xFF555555),
-                  height: 1.6,
-                ),
-              ),
-            ],
-          ],
-        ),
-      ),
-    );
-  }
-}