feat: UI清爽紫蓝风全面改造 + 对话卡片重构 + 配色体系升级

- 新增 AppColors 统一配色方案（清爽紫蓝，参考蚂蚁阿福风格）
- 新增 common_widgets（GradientBorderButton / CardActionButton / IconBox）
- AgentWelcomeCard 美化：渐变 header + AI标签 + 核心功能区 + 快捷操作区
- DataConfirmCard 统一：三合一（健康/药品/运动），可编辑字段列表
- 删除死代码：medicationConfirm/dietAnalysis/reportAnalysis/quickOptions 卡片
- 删除死路由：doctors/profileEdit/editProfile
- AI 对话去除 Markdown 符号（_stripMd），统一行间距 1.5
- 逐字淡入动画修复：key 改用 stableId 避免重复触发
- 健康概览时间修复：前端发送 UTC 避免时区歧义
- PG 数据目录迁入项目 backend/pgdata/，加入 .gitignore
- 新增欧姆龙血压计实施方案文档

health_app/lib/core/app_theme.dart

@@ -1,31 +1,32 @@
 import 'package:flutter/material.dart';
 import 'package:shadcn_ui/shadcn_ui.dart';
+import 'app_colors.dart';
 
-/// 健康管家 — 淡紫清新风
+/// 健康管家 — 清爽紫蓝风
 class AppTheme {
   AppTheme._();
 
-  // ── 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
+  // ── 主色调 ──
+  static const Color primary      = AppColors.primaryPurple;
+  static const Color primaryLight = AppColors.iconBackground;
+  static const Color primaryDark  = AppColors.iconColor;
+  static const Color primaryGlow  = AppColors.purpleGradientStart;
 
   // ── 中性色 ──
-  static const Color bg       = Color(0xFFFAF9FF); // 淡紫白
-  static const Color surface  = Color(0xFFFFFFFF);
-  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);
+  static const Color bg       = AppColors.backgroundSecondary;
+  static const Color surface  = AppColors.cardBackground;
+  static const Color text     = AppColors.textPrimary;
+  static const Color textSub  = AppColors.textSecondary;
+  static const Color textHint = AppColors.textHint;
+  static const Color border   = AppColors.border;
+  static const Color divider  = AppColors.borderLight;
 
   // ── 语义色 ──
-  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
+  static const Color success = AppColors.success;
+  static const Color error   = AppColors.error;
+  static const Color warning = AppColors.warning;
+  static const Color accent  = AppColors.primaryBlue;
+  static const Color info    = AppColors.primaryBlue;
 
   // ── 圆角 ──
   static const double rXs  = 6;
@@ -53,13 +54,13 @@ class AppTheme {
 
   // ── 智能体配色 ──
   static const Map<String, Color> agentColors = {
-    'default':      Color(0xFFEDEAFF), // 淡紫
-    'consultation': Color(0xFFE0F0FF), // 淡天蓝
-    'health':       Color(0xFFE8FFE8), // 淡翠绿
-    'diet':         Color(0xFFFFF0E0), // 淡杏
-    'medication':   Color(0xFFFFE8EC), // 淡粉
-    'report':       Color(0xFFE8F0FF), // 淡水蓝
-    'exercise':     Color(0xFFF0E8FF), // 淡紫
+    'default':      AppColors.iconBackground,
+    'consultation': Color(0xFFE0F0FF),
+    'health':       Color(0xFFE8FFE8),
+    'diet':         Color(0xFFFFF0E0),
+    'medication':   Color(0xFFFFE8EC),
+    'report':       Color(0xFFE8F0FF),
+    'exercise':     Color(0xFFF0E8FF),
   };
 
   static Color agentLight(String? name) => agentColors[name] ?? primaryLight;
@@ -141,9 +142,9 @@ class AppTheme {
           popoverForeground: text,
           primary: primary,
           primaryForeground: Colors.white,
-          secondary: Color(0xFFF4F2FA),
+          secondary: divider,
           secondaryForeground: text,
-          muted: Color(0xFFF4F2FA),
+          muted: divider,
           mutedForeground: textSub,
           accent: accent,
           accentForeground: Colors.white,
@@ -152,7 +153,7 @@ class AppTheme {
           border: border,
           input: border,
           ring: primary,
-          selection: Color(0xFFD9D4FF),
+          selection: primaryGlow,
         ),
         radius: BorderRadius.circular(rMd),
       );