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/home/home_page.dart

@@ -33,6 +33,7 @@ class _HomePageState extends ConsumerState<HomePage> {
     final imagePath = _pickedImagePath;
     if (text.isEmpty && imagePath == null) return;
     _textCtrl.clear();
+    _focusNode.unfocus(); // 收起键盘
     setState(() => _pickedImagePath = null);
     if (imagePath != null) {
       ref.read(chatProvider.notifier).sendImage(imagePath, text);
@@ -132,32 +133,22 @@ class _HomePageState extends ConsumerState<HomePage> {
         separatorBuilder: (_, i) => const SizedBox(width: 6),
         itemBuilder: (_, i) {
           final (agent, label, icon) = _agentDefs[i];
-          final isActive = selected == agent;
           return GestureDetector(
             onTap: () {
-              final notifier = ref.read(selectedAgentProvider.notifier);
-              if (isActive) {
-                notifier.select(null);
-              } else {
-                notifier.select(agent);
-                ref.read(chatProvider.notifier).setAgent(agent);
-                if (_welcomedAgents.add(agent)) {
-                  ref.read(chatProvider.notifier).insertAgentWelcome(agent);
-                }
-              }
+              // 用户标签 → 欢迎卡片，不发 AI 后端
+              ref.read(chatProvider.notifier).triggerAgent(agent, label);
             },
-            child: AnimatedContainer(
-              duration: const Duration(milliseconds: 200),
+            child: Container(
               padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
               decoration: BoxDecoration(
-                color: isActive ? AppTheme.primary : theme.colorScheme.card,
+                color: theme.colorScheme.card,
                 borderRadius: BorderRadius.circular(AppTheme.rPill),
-                boxShadow: isActive ? [AppTheme.shadowLight] : null,
+                border: Border.all(color: theme.colorScheme.border),
               ),
               child: Row(mainAxisSize: MainAxisSize.min, children: [
-                Icon(icon, size: 17, color: isActive ? Colors.white : theme.colorScheme.mutedForeground),
+                Icon(icon, size: 17, color: theme.colorScheme.mutedForeground),
                 const SizedBox(width: 4),
-                Text(label, style: TextStyle(fontSize: 15, fontWeight: isActive ? FontWeight.w600 : FontWeight.w500, color: isActive ? Colors.white : theme.colorScheme.mutedForeground)),
+                Text(label, style: TextStyle(fontSize: 15, fontWeight: FontWeight.w500, color: theme.colorScheme.mutedForeground)),
               ]),
             ),
           );