fix: 绿色主题回滚为淡紫清新风

朝露绿翻车，换回柔和紫(#7C6FF7) + 淡紫白底(#FAF9FF)

health_app/lib/core/app_theme.dart

@@ -1,32 +1,31 @@
 import 'package:flutter/material.dart';
 import 'package:shadcn_ui/shadcn_ui.dart';
 
-/// 健康管家 —「朝露」Morning Dew
-/// 深青绿 + 薄荷白，植物系清新风格
+/// 健康管家 — 淡紫清新风
 class AppTheme {
   AppTheme._();
 
-  // ── 主色调：深青绿 ──
-  static const Color primary      = Color(0xFF2D6A4F); // 深青绿
-  static const Color primaryLight = Color(0xFFD8F3DC); // 浅薄荷
-  static const Color primaryDark  = Color(0xFF1B4332); // 深森林
-  static const Color primaryGlow  = Color(0xFFB7E4C7); // 发光薄荷
+  // ── 主色调：柔和紫 ──
+  static const Color primary      = Color(0xFF7C6FF7); // 柔紫
+  static const Color primaryLight = Color(0xFFEDEAFF); // 浅薰衣草
+  static const Color primaryDark  = Color(0xFF4A3FBE); // 深紫
+  static const Color primaryGlow  = Color(0xFFD9D4FF); // 发光紫
 
   // ── 中性色 ──
-  static const Color bg       = Color(0xFFF7FAF8); // 暖白底
+  static const Color bg       = Color(0xFFFAF9FF); // 淡紫白
   static const Color surface  = Color(0xFFFFFFFF);
-  static const Color text     = Color(0xFF1B281F); // 深绿黑
-  static const Color textSub  = Color(0xFF6B7B6F); // 灰绿
-  static const Color textHint = Color(0xFFB7BFB9); // 浅灰绿
-  static const Color border   = Color(0xFFE0E8E2);
-  static const Color divider  = Color(0xFFF0F4F1);
+  static const Color text     = Color(0xFF1E1B2E); // 紫黑
+  static const Color textSub  = Color(0xFF6E6B82); // 灰紫
+  static const Color textHint = Color(0xFFB5B2C8); // 浅灰紫
+  static const Color border   = Color(0xFFE8E6F0);
+  static const Color divider  = Color(0xFFF4F2FA);
 
   // ── 语义色 ──
-  static const Color success = Color(0xFF40916C); // 翠绿
-  static const Color error   = Color(0xFFE07A5F); // 陶土红
-  static const Color warning = Color(0xFFF2CC8F); // 蜂蜜黄
-  static const Color accent  = Color(0xFF81B29A); // 中青绿
-  static const Color info    = Color(0xFF52B788); // 亮绿
+  static const Color success = Color(0xFF52B788); // 翠绿
+  static const Color error   = Color(0xFFE85D75); // 柔红
+  static const Color warning = Color(0xFFF5B041); // 暖琥珀
+  static const Color accent  = Color(0xFFA78BFA); // 中紫
+  static const Color info    = Color(0xFF7C6FF7); // 柔紫
 
   // ── 圆角 ──
   static const double rXs  = 6;
@@ -54,7 +53,7 @@ class AppTheme {
 
   // ── 智能体配色 ──
   static const Map<String, Color> agentColors = {
-    'default':      Color(0xFFD8F3DC), // 薄荷
+    'default':      Color(0xFFEDEAFF), // 淡紫
     'consultation': Color(0xFFE0F0FF), // 淡天蓝
     'health':       Color(0xFFE8FFE8), // 淡翠绿
     'diet':         Color(0xFFFFF0E0), // 淡杏
@@ -75,7 +74,7 @@ class AppTheme {
           brightness: Brightness.light,
         ),
         scaffoldBackgroundColor: bg,
-        fontFamily: null, // 使用系统默认字体
+        fontFamily: null,
 
         appBarTheme: const AppBarTheme(
           backgroundColor: surface,
@@ -142,9 +141,9 @@ class AppTheme {
           popoverForeground: text,
           primary: primary,
           primaryForeground: Colors.white,
-          secondary: Color(0xFFF0F4F1),
+          secondary: Color(0xFFF4F2FA),
           secondaryForeground: text,
-          muted: Color(0xFFF0F4F1),
+          muted: Color(0xFFF4F2FA),
           mutedForeground: textSub,
           accent: accent,
           accentForeground: Colors.white,
@@ -153,7 +152,7 @@ class AppTheme {
           border: border,
           input: border,
           ring: primary,
-          selection: Color(0xFFB7E4C7),
+          selection: Color(0xFFD9D4FF),
         ),
         radius: BorderRadius.circular(rMd),
       );