feat: UI全面改造 + 后端多项修复

【后端修复】
- 删除diet/consultation agent假工具声明
- 修复DayOfWeek实体注释
- 修复Vision API content序列化
- cleanup_service级联删除修复
- 用药提醒时区偏差修复
- 统一DateTime处理(UtcNow+8)
- 新增UTC DateTime JSON转换器

【前端UI重构】
- 配色体系全面更新(#8B5CF6淡紫+#F0ECFF背景)
- 登录页重设计
- 首页重设计(透明顶栏、渐变背景、胶囊输入区)
- 聊天卡片加白蓝边框、渐变标题
- 侧边栏重构(渐变背景、合并顶部、删除底部设置)
- 确认卡片可编辑字段恢复
- 所有子页面加返回按钮
- catch异常加日志
- 删除后refresh provider缓存

health_app/lib/core/app_theme.dart

@@ -2,7 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:shadcn_ui/shadcn_ui.dart';
 import 'app_colors.dart';
 
-/// 健康管家 —— 蚂蚁阿福风格：紫蓝渐变 + 超大圆角 + 漂浮卡片
+/// 健康管家 — 设计规范 v1.0：紫色系 + 干净白灰 + 12px圆角
 class AppTheme {
   AppTheme._();
 
@@ -11,8 +11,8 @@ class AppTheme {
   static const Color primaryLight = AppColors.primaryLight;
   static const Color primaryDark = AppColors.primaryDark;
   static const Color primaryMid = AppColors.primaryMid;
-  static const Color accent = AppColors.accentCyan;
-  static const Color info = AppColors.accentCyan;
+  static const Color accent = AppColors.success;
+  static const Color info = AppColors.blueMeasure;
 
   // ── 中性色 ──
   static const Color bg = AppColors.background;
@@ -33,51 +33,51 @@ class AppTheme {
   static const Color warning = AppColors.warning;
   static const Color warningLight = AppColors.warningLight;
 
-  // ── 圆角（阿福风格：超大圆角）──
-  static const double rXs = 8;
-  static const double rSm = 12;
-  static const double rMd = 18;
-  static const double rLg = 24;
-  static const double rXl = 32;
+  // ── 圆角（规范：12px 卡片）──
+  static const double rXs = 4;
+  static const double rSm = 8;
+  static const double rMd = 12;
+  static const double rLg = 16;
+  static const double rXl = 20;
   static const double rPill = 999;
 
-  // ── 间距 ──
+  // ── 间距（8px 网格）──
   static const double sXs = 4;
   static const double sSm = 8;
   static const double sMd = 12;
   static const double sLg = 16;
   static const double sXl = 20;
-  static const double sXxl = 28;
+  static const double sXxl = 24;
 
-  // ── 阴影（淡紫柔和阴影）──
+  // ── 阴影（轻阴影）──
   static BoxShadow get shadowCard => BoxShadow(
-        color: AppColors.primary.withOpacity(0.08),
-        blurRadius: 24,
-        offset: const Offset(0, 8),
+        color: Colors.black.withOpacity(0.06),
+        blurRadius: 8,
+        offset: const Offset(0, 2),
       );
   static BoxShadow get shadowLight => BoxShadow(
-        color: AppColors.primary.withOpacity(0.05),
-        blurRadius: 16,
-        offset: const Offset(0, 4),
+        color: Colors.black.withOpacity(0.04),
+        blurRadius: 6,
+        offset: const Offset(0, 1),
       );
   static BoxShadow get shadowElevated => BoxShadow(
-        color: AppColors.primary.withOpacity(0.15),
-        blurRadius: 32,
-        offset: const Offset(0, 10),
+        color: primary.withOpacity(0.08),
+        blurRadius: 12,
+        offset: const Offset(0, 4),
       );
   static BoxShadow get shadowButton => BoxShadow(
-        color: AppColors.primary.withOpacity(0.25),
-        blurRadius: 16,
-        offset: const Offset(0, 6),
+        color: primary.withOpacity(0.25),
+        blurRadius: 12,
+        offset: const Offset(0, 4),
       );
 
   // ── 智能体配色 ──
   static const Map<String, Color> agentColors = {
-    'default': AppColors.primaryLight,
+    'default': Color(0xFFEDE9FE),
     'consultation': Color(0xFFE0E7FF),
-    'health': Color(0xFFDCFCE7),
+    'health': Color(0xFFD1FAE5),
     'diet': Color(0xFFFEF3C7),
-    'medication': Color(0xFFFCE7F3),
+    'medication': Color(0xFFFEE2E2),
     'report': Color(0xFFDBEAFE),
     'exercise': Color(0xFFEDE9FE),
   };
@@ -94,70 +94,75 @@ class AppTheme {
           onPrimary: Colors.white,
           secondary: accent,
           surface: surface,
-          background: bg,
           brightness: Brightness.light,
         ),
         scaffoldBackgroundColor: bg,
         splashColor: Colors.transparent,
         highlightColor: Colors.transparent,
-        hoverColor: primaryLight.withOpacity(0.5),
+        hoverColor: primaryLight.withOpacity(0.3),
         fontFamily: null,
 
         appBarTheme: AppBarTheme(
-          backgroundColor: bg,
+          backgroundColor: surface,
           foregroundColor: text,
           elevation: 0,
-          centerTitle: false,
+          centerTitle: true,
           scrolledUnderElevation: 0,
-          titleTextStyle: TextStyle(fontSize: 22, fontWeight: FontWeight.w700, color: text),
+          titleTextStyle: TextStyle(fontSize: 18, fontWeight: FontWeight.w600, color: text),
+          toolbarHeight: 44,
         ),
 
         cardTheme: CardThemeData(
           color: surface,
           elevation: 0,
-          shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(rLg)),
+          shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(rMd)),
           margin: EdgeInsets.zero,
         ),
 
         inputDecorationTheme: InputDecorationTheme(
           filled: true,
           fillColor: bgSoft,
-          contentPadding: const EdgeInsets.symmetric(horizontal: sLg, vertical: 16),
-          border: OutlineInputBorder(borderRadius: BorderRadius.circular(rMd), borderSide: BorderSide.none),
-          enabledBorder: OutlineInputBorder(borderRadius: BorderRadius.circular(rMd), borderSide: BorderSide.none),
-          focusedBorder: OutlineInputBorder(
-            borderRadius: BorderRadius.circular(rMd),
-            borderSide: const BorderSide(color: primary, width: 2),
+          contentPadding: const EdgeInsets.symmetric(horizontal: sLg, vertical: 12),
+          border: OutlineInputBorder(
+            borderRadius: BorderRadius.circular(10),
+            borderSide: BorderSide.none,
           ),
-          hintStyle: TextStyle(color: textHint, fontSize: 16),
+          enabledBorder: OutlineInputBorder(
+            borderRadius: BorderRadius.circular(10),
+            borderSide: BorderSide.none,
+          ),
+          focusedBorder: OutlineInputBorder(
+            borderRadius: BorderRadius.circular(10),
+            borderSide: const BorderSide(color: primary, width: 1),
+          ),
+          hintStyle: TextStyle(color: textHint, fontSize: 15),
         ),
 
         elevatedButtonTheme: ElevatedButtonThemeData(
           style: ElevatedButton.styleFrom(
             backgroundColor: primary,
             foregroundColor: Colors.white,
-            minimumSize: const Size(double.infinity, 56),
-            shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(rPill)),
-            textStyle: const TextStyle(fontSize: 17, fontWeight: FontWeight.w600),
+            minimumSize: const Size(double.infinity, 52),
+            shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(rMd)),
+            textStyle: const TextStyle(fontSize: 18, fontWeight: FontWeight.w600),
             elevation: 0,
-            shadowColor: primary.withOpacity(0.3),
           ),
         ),
 
-        dialogTheme: DialogThemeData(shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(rXl))),
+        dialogTheme: DialogThemeData(shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(rLg))),
 
         textTheme: const TextTheme(
-          headlineLarge: TextStyle(fontSize: 28, fontWeight: FontWeight.w700, color: text, letterSpacing: -0.3),
-          titleLarge: TextStyle(fontSize: 22, fontWeight: FontWeight.w700, color: text),
-          titleMedium: TextStyle(fontSize: 20, fontWeight: FontWeight.w600, color: text),
-          bodyLarge: TextStyle(fontSize: 16, color: text, height: 1.5),
-          bodyMedium: TextStyle(fontSize: 14, color: textSub, height: 1.4),
+          headlineLarge: TextStyle(fontSize: 24, fontWeight: FontWeight.w700, color: text),
+          titleLarge: TextStyle(fontSize: 18, fontWeight: FontWeight.w600, color: text),
+          titleMedium: TextStyle(fontSize: 16, fontWeight: FontWeight.w500, color: text),
+          bodyLarge: TextStyle(fontSize: 15, color: text, height: 1.5),
+          bodyMedium: TextStyle(fontSize: 13, color: textSub, height: 1.4),
           labelMedium: TextStyle(fontSize: 13, color: textSub),
           labelSmall: TextStyle(fontSize: 12, color: textHint),
         ),
       );
 
-  // ── Shadcn UI 主题（紫蓝系） ──
+  // ── Shadcn UI 主题 ──
   static ShadThemeData get shadTheme => ShadThemeData(
         brightness: Brightness.light,
         colorScheme: ShadVioletColorScheme.light(