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/pages/consultation/consultation_pages.dart

@@ -7,108 +7,6 @@ import '../../core/navigation_provider.dart';
 import '../../providers/data_providers.dart';
 import '../../providers/consultation_provider.dart';
 
-/// 医生列表页
-class DoctorListPage extends ConsumerWidget {
-  const DoctorListPage({super.key});
-  @override
-  Widget build(BuildContext context, WidgetRef ref) {
-    final doctors = ref.watch(doctorListProvider);
-    return Scaffold(
-      appBar: AppBar(title: const Text('选择医生')),
-      body: doctors.when(
-        data: (list) {
-          if (list.isEmpty) {
-            return Center(
-              child: Column(
-                mainAxisSize: MainAxisSize.min,
-                children: [
-                  Icon(Icons.person_search, size: 64, color: Colors.grey[300]),
-                  const SizedBox(height: 12),
-                  Text('暂无可用医生', style: Theme.of(context).textTheme.bodyMedium),
-                ],
-              ),
-            );
-          }
-          return SizedBox(
-            height: 330,
-            child: ListView.builder(
-              scrollDirection: Axis.horizontal,
-              padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 12),
-              itemCount: list.length,
-              itemBuilder: (ctx, i) {
-                final d = list[i];
-                return Container(
-                  width: 155,
-                  margin: const EdgeInsets.symmetric(horizontal: 5),
-                  decoration: BoxDecoration(
-                    color: Colors.white,
-                    borderRadius: BorderRadius.circular(20),
-                    boxShadow: [
-                      BoxShadow(color: AppTheme.primary.withAlpha(15), blurRadius: 12, offset: const Offset(0, 4))
-                    ],
-                  ),
-                  child: Padding(
-                    padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 16),
-                    child: Column(
-                      mainAxisSize: MainAxisSize.min,
-                      children: [
-                        CircleAvatar(
-                          radius: 28,
-                          backgroundColor: AppTheme.primaryLight,
-                          child: Text(
-                            (d['name'] as String?)?.isNotEmpty == true ? d['name']![0] : '?',
-                            style: const TextStyle(fontSize: 25, fontWeight: FontWeight.w600, color: AppTheme.primaryLight),
-                          ),
-                        ),
-                        const SizedBox(height: 10),
-                        Container(
-                          padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 3),
-                          decoration: BoxDecoration(
-                            color: AppTheme.primaryLight,
-                            borderRadius: BorderRadius.circular(6),
-                          ),
-                          child: Text(d['title'] ?? '', style: const TextStyle(fontSize: 15, color: AppTheme.primaryLight, fontWeight: FontWeight.w500)),
-                        ),
-                        const SizedBox(height: 6),
-                        Text(d['department'] ?? '', style: const TextStyle(fontSize: 17, fontWeight: FontWeight.w600, color: Color(0xFF333333))),
-                        const SizedBox(height: 8),
-                        Text(d['introduction'] ?? '',
-                            style: const TextStyle(fontSize: 15, color: Color(0xFF888888), height: 1.4),
-                            maxLines: 4,
-                            overflow: TextOverflow.ellipsis,
-                            textAlign: TextAlign.center),
-                        const SizedBox(height: 14),
-                        SizedBox(
-                          width: double.infinity,
-                          height: 34,
-                          child: ElevatedButton(
-                            onPressed: () => pushRoute(ref, 'consultation', params: {'id': d['id']?.toString() ?? ''}),
-                            style: ElevatedButton.styleFrom(
-                              backgroundColor: AppTheme.primary,
-                              foregroundColor: Colors.white,
-                              shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(10)),
-                              padding: EdgeInsets.zero,
-                            ),
-                            child: const Text('立即咨询', style: TextStyle(fontSize: 16, fontWeight: FontWeight.w600)),
-                          ),
-                        ),
-                      ],
-                    ),
-                  ),
-                );
-              },
-            ),
-          );
-        },
-        loading: () => const Center(child: CircularProgressIndicator()),
-        error: (_, _) => Center(
-          child: Text('加载失败', style: Theme.of(context).textTheme.bodyMedium),
-        ),
-      ),
-    );
-  }
-}
-
 /// 问诊对话页 — 完整的 AI 分身聊天界面
 class DoctorChatPage extends ConsumerStatefulWidget {
   final String id;