feat(ASA): 添加导航菜单入口，将系统配置整合为下拉菜单

- 将知识库导航指向新的多知识库管理页面
- 将嵌入模型、LLM 配置、Prompt 模板、意图规则、话术流程、输出护栏整合到「系统配置」下拉菜单
- 添加下拉菜单样式和交互效果

ai-service-admin/src/App.vue

@@ -17,7 +17,7 @@
             <el-icon><Odometer /></el-icon>
             <span>控制台</span>
           </router-link>
-          <router-link to="/kb" class="nav-item" :class="{ active: isActive('/kb') }">
+          <router-link to="/admin/knowledge-bases" class="nav-item" :class="{ active: isActive('/admin/knowledge-bases') }">
             <el-icon><FolderOpened /></el-icon>
             <span>知识库</span>
           </router-link>
@@ -30,14 +30,53 @@
             <span>会话监控</span>
           </router-link>
           <div class="nav-divider"></div>
-          <router-link to="/admin/embedding" class="nav-item" :class="{ active: isActive('/admin/embedding') }">
-            <el-icon><Connection /></el-icon>
-            <span>嵌入模型</span>
-          </router-link>
-          <router-link to="/admin/llm" class="nav-item" :class="{ active: isActive('/admin/llm') }">
-            <el-icon><ChatDotSquare /></el-icon>
-            <span>LLM 配置</span>
-          </router-link>
+          <el-dropdown trigger="hover" placement="bottom-start">
+            <div class="nav-item dropdown-trigger" :class="{ active: isAdminActive }">
+              <el-icon><Setting /></el-icon>
+              <span>系统配置</span>
+              <el-icon class="dropdown-arrow"><ArrowDown /></el-icon>
+            </div>
+            <template #dropdown>
+              <el-dropdown-menu class="admin-dropdown-menu">
+                <el-dropdown-item>
+                  <router-link to="/admin/embedding" class="dropdown-link">
+                    <el-icon><Connection /></el-icon>
+                    嵌入模型
+                  </router-link>
+                </el-dropdown-item>
+                <el-dropdown-item>
+                  <router-link to="/admin/llm" class="dropdown-link">
+                    <el-icon><ChatDotSquare /></el-icon>
+                    LLM 配置
+                  </router-link>
+                </el-dropdown-item>
+                <el-dropdown-item divided>
+                  <router-link to="/admin/prompt-templates" class="dropdown-link">
+                    <el-icon><Document /></el-icon>
+                    Prompt 模板
+                  </router-link>
+                </el-dropdown-item>
+                <el-dropdown-item>
+                  <router-link to="/admin/intent-rules" class="dropdown-link">
+                    <el-icon><Aim /></el-icon>
+                    意图规则
+                  </router-link>
+                </el-dropdown-item>
+                <el-dropdown-item>
+                  <router-link to="/admin/script-flows" class="dropdown-link">
+                    <el-icon><Share /></el-icon>
+                    话术流程
+                  </router-link>
+                </el-dropdown-item>
+                <el-dropdown-item>
+                  <router-link to="/admin/guardrails" class="dropdown-link">
+                    <el-icon><Shield /></el-icon>
+                    输出护栏
+                  </router-link>
+                </el-dropdown-item>
+              </el-dropdown-menu>
+            </template>
+          </el-dropdown>
         </nav>
       </div>
       <div class="header-right">
@@ -70,7 +109,7 @@ import { ref, computed, onMounted } from 'vue'
 import { useRoute } from 'vue-router'
 import { useTenantStore } from '@/stores/tenant'
 import { getTenantList, type Tenant } from '@/api/tenant'
-import { Odometer, FolderOpened, Cpu, Monitor, Connection, ChatDotSquare } from '@element-plus/icons-vue'
+import { Odometer, FolderOpened, Cpu, Monitor, Connection, ChatDotSquare, Setting, ArrowDown, Document, Aim, Share, Shield } from '@element-plus/icons-vue'
 import { ElMessage } from 'element-plus'
 
 const route = useRoute()
@@ -84,6 +123,10 @@ const isActive = (path: string) => {
   return route.path === path || route.path.startsWith(path + '/')
 }
 
+const isAdminActive = computed(() => {
+  return route.path.startsWith('/admin')
+})
+
 const handleTenantChange = (val: string) => {
   tenantStore.setTenant(val)
   // 刷新页面以加载新租户的数据
@@ -212,6 +255,21 @@ onMounted(() => {
   font-size: 16px;
 }
 
+.dropdown-trigger {
+  cursor: pointer;
+}
+
+.dropdown-arrow {
+  font-size: 12px;
+  margin-left: 4px;
+  transition: transform 0.2s;
+}
+
+.dropdown-trigger:hover .dropdown-arrow,
+.dropdown-trigger.active .dropdown-arrow {
+  transform: rotate(180deg);
+}
+
 .nav-divider {
   width: 1px;
   height: 20px;
@@ -274,3 +332,32 @@ onMounted(() => {
   }
 }
 </style>
+
+<style>
+.admin-dropdown-menu {
+  min-width: 160px;
+}
+
+.admin-dropdown-menu .el-dropdown-menu__item {
+  padding: 0;
+}
+
+.dropdown-link {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  padding: 8px 16px;
+  width: 100%;
+  color: var(--text-primary, #1E293B);
+  text-decoration: none;
+  font-size: 14px;
+}
+
+.dropdown-link:hover {
+  color: var(--primary-color, #4F7CFF);
+}
+
+.dropdown-link .el-icon {
+  font-size: 16px;
+}
+</style>