feat: 饮食记录逻辑重构 + 通知管理分隔线修复 + 多页面 UI 调整

- 饮食: 新增 DietCommentaryPolicy + diet_record_logic, 饮食记录逻辑抽取复用
- 通知管理: 分隔线改为仿通知中心样式, 跳过图标区域只留文字下方
- 侧边栏: 对话记录操作栏浮层修复 + 常用功能间距收紧
- 智能体: 欢迎卡片去 400ms 延迟 + 胶囊去阴影
- 后端: AI 会话仓库新增方法 + 饮食评论策略 + 健康记录规则调整
- 其他: api_client IP 适配 + 多页面 UI 微调 + 新增测试

health_app/lib/widgets/app_empty_state.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import '../core/app_colors.dart';
+import 'app_gradient_widgets.dart';
 
 class AppEmptyState extends StatelessWidget {
   final IconData icon;
@@ -32,7 +33,7 @@ class AppEmptyState extends StatelessWidget {
                 border: Border.all(color: AppColors.borderLight),
                 boxShadow: AppColors.cardShadowLight,
               ),
-              child: Icon(icon, size: 34, color: AppColors.primaryDark),
+              child: AppGradientIcon(icon: icon, size: 34),
             ),
             const SizedBox(height: 18),
             Text(

health_app/lib/widgets/app_error_state.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import '../core/app_colors.dart';
+import 'app_gradient_widgets.dart';
 
 /// 统一的"加载失败"状态——与 AppEmptyState 风格一致，区别在于明确表达"出错了，可重试"，
 /// 避免把网络/服务失败误显示成"暂无数据"。
@@ -32,10 +33,9 @@ class AppErrorState extends StatelessWidget {
                 border: Border.all(color: AppColors.borderLight),
                 boxShadow: AppColors.cardShadowLight,
               ),
-              child: const Icon(
-                Icons.cloud_off_outlined,
+              child: const AppGradientIcon(
+                icon: Icons.cloud_off_outlined,
                 size: 34,
-                color: AppColors.primaryDark,
               ),
             ),
             const SizedBox(height: 18),
@@ -61,17 +61,9 @@ class AppErrorState extends StatelessWidget {
             ],
             if (onRetry != null) ...[
               const SizedBox(height: 20),
-              OutlinedButton.icon(
-                onPressed: onRetry,
-                icon: const Icon(Icons.refresh, size: 18),
-                label: const Text('重试'),
-                style: OutlinedButton.styleFrom(
-                  foregroundColor: AppColors.primaryDark,
-                  side: const BorderSide(color: AppColors.borderLight),
-                  shape: RoundedRectangleBorder(
-                    borderRadius: BorderRadius.circular(12),
-                  ),
-                ),
+              SizedBox(
+                width: 116,
+                child: AppGradientOutlineButton(label: '重试', onTap: onRetry!),
               ),
             ],
           ],

health_app/lib/widgets/app_gradient_widgets.dart

@@ -0,0 +1,93 @@
+import 'package:flutter/material.dart';
+
+import '../core/app_colors.dart';
+
+class AppGradientText extends StatelessWidget {
+  final String text;
+  final TextStyle style;
+  final Gradient gradient;
+  final TextAlign? textAlign;
+
+  const AppGradientText(
+    this.text, {
+    super.key,
+    required this.style,
+    this.gradient = AppColors.primaryGradient,
+    this.textAlign,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return ShaderMask(
+      shaderCallback: gradient.createShader,
+      blendMode: BlendMode.srcIn,
+      child: Text(
+        text,
+        textAlign: textAlign,
+        style: style.copyWith(color: Colors.white),
+      ),
+    );
+  }
+}
+
+class AppGradientIcon extends StatelessWidget {
+  final IconData icon;
+  final double size;
+  final Gradient gradient;
+
+  const AppGradientIcon({
+    super.key,
+    required this.icon,
+    required this.size,
+    this.gradient = AppColors.primaryGradient,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return ShaderMask(
+      shaderCallback: gradient.createShader,
+      blendMode: BlendMode.srcIn,
+      child: Icon(icon, size: size, color: Colors.white),
+    );
+  }
+}
+
+class AppGradientOutlineButton extends StatelessWidget {
+  final String label;
+  final VoidCallback onTap;
+  final Gradient gradient;
+
+  const AppGradientOutlineButton({
+    super.key,
+    required this.label,
+    required this.onTap,
+    this.gradient = AppColors.primaryGradient,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return GestureDetector(
+      onTap: onTap,
+      child: Container(
+        height: 50,
+        decoration: BoxDecoration(
+          gradient: gradient,
+          borderRadius: BorderRadius.circular(18),
+        ),
+        padding: const EdgeInsets.all(1.2),
+        child: Container(
+          alignment: Alignment.center,
+          decoration: BoxDecoration(
+            color: Colors.white,
+            borderRadius: BorderRadius.circular(17),
+          ),
+          child: AppGradientText(
+            label,
+            gradient: gradient,
+            style: const TextStyle(fontSize: 16, fontWeight: FontWeight.w800),
+          ),
+        ),
+      ),
+    );
+  }
+}

health_app/lib/widgets/health_drawer.dart

@@ -380,25 +380,25 @@ class _NavigationSection extends StatelessWidget {
         icon: LucideIcons.folderHeart,
         title: '档案',
         route: 'healthArchive',
-        colors: const [Color(0xFF93C5FD), Color(0xFF60A5FA)],
+        colors: AppColors.healthGradient.colors,
       ),
       _NavItem(
         icon: LucideIcons.fileText,
         title: '报告',
         route: 'reports',
-        colors: const [Color(0xFFBFDBFE), Color(0xFF93C5FD)],
+        colors: AppColors.reportGradient.colors,
       ),
       _NavItem(
         icon: LucideIcons.pill,
         title: '用药',
         route: 'medications',
-        colors: const [Color(0xFFDDD6FE), Color(0xFFC4B5FD)],
+        colors: AppColors.medicationGradient.colors,
       ),
       _NavItem(
         icon: LucideIcons.utensils,
         title: '饮食',
         route: 'dietRecords',
-        colors: const [Color(0xFFFBCFE8), Color(0xFFF472B6)],
+        colors: AppColors.dietGradient.colors,
       ),
       _NavItem(
         icon: LucideIcons.calendarDays,
@@ -416,13 +416,13 @@ class _NavigationSection extends StatelessWidget {
         icon: LucideIcons.footprints,
         title: '运动',
         route: 'exercisePlan',
-        colors: const [Color(0xFFA5F3FC), Color(0xFF67E8F9)],
+        colors: AppColors.exerciseGradient.colors,
       ),
       _NavItem(
         icon: LucideIcons.bluetooth,
         title: '设备',
         route: 'devices',
-        colors: const [Color(0xFF60A5FA), Color(0xFFC4B5FD)],
+        colors: AppColors.deviceGradient.colors,
       ),
     ];
 
@@ -466,14 +466,14 @@ class _NavTile extends StatelessWidget {
   };
 
   List<Color> get _colors => switch (item.route) {
-    'healthArchive' => const [AppColors.healthLight, AppColors.health],
-    'reports' => const [AppColors.reportLight, AppColors.report],
-    'medications' => const [AppColors.medicationLight, AppColors.medication],
-    'dietRecords' => const [AppColors.dietLight, AppColors.diet],
+    'healthArchive' => AppColors.healthGradient.colors,
+    'reports' => AppColors.reportGradient.colors,
+    'medications' => AppColors.medicationGradient.colors,
+    'dietRecords' => AppColors.dietGradient.colors,
     'calendar' => const [AppColors.calendarLight, AppColors.calendar],
     'followups' => const [AppColors.followupLight, AppColors.followup],
-    'exercisePlan' => const [AppColors.exerciseLight, AppColors.exercise],
-    'devices' => const [AppColors.deviceLight, AppColors.device],
+    'exercisePlan' => AppColors.exerciseGradient.colors,
+    'devices' => AppColors.deviceGradient.colors,
     _ => item.colors,
   };