refactor(emergency-app): 按角色重构目录结构

将模块优先改为角色优先的目录布局：
- expert/ assistant/ operator/ worker/ onsite/ admin/ 各含 workbench/knowledge/profile
- ai-assistant/ 和 message/ 保持全角色共享
- 更新所有文件间的相对路径引用

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

emergency-app/message/index.html

@@ -223,12 +223,12 @@
   <!-- 底部Tab导航栏 -->
   <div class="tab-bar">
     <!-- 工作台 -->
-    <a href="../workbench/expert/index.html" class="tab-item">
+    <a href="../expert/workbench/index.html" class="tab-item">
       <span class="tab-icon">🏥</span>
       <span class="tab-label">工作台</span>
     </a>
     <!-- 知识库 -->
-    <a href="../knowledge/index.html" class="tab-item">
+    <a href="../expert/knowledge/index.html" class="tab-item">
       <span class="tab-icon">📚</span>
       <span class="tab-label">知识库</span>
     </a>
@@ -244,7 +244,7 @@
       <span class="tab-badge">2</span>
     </a>
     <!-- 我的 -->
-    <a href="../profile/index.html" class="tab-item">
+    <a href="../expert/profile/index.html" class="tab-item">
       <span class="tab-icon">👤</span>
       <span class="tab-label">我的</span>
     </a>