feat: 将终端标签页移至左侧边栏

- 在 MainLayout 侧边栏添加终端标签区域
- 标签纵向排列在连接列表下方
- 点击标签自动切换到终端工作区并激活
- 简化 TerminalWorkspaceView 移除顶部标签栏和返回按钮
- 不用返回就能切换连接和打开新终端

frontend/src/views/TerminalWorkspaceView.vue

@@ -1,12 +1,9 @@
 <script setup lang="ts">
 import { computed, onMounted } from 'vue'
-import { useRouter } from 'vue-router'
 import { useTerminalTabsStore } from '../stores/terminalTabs'
 import { useConnectionsStore } from '../stores/connections'
 import TerminalWidget from '../components/TerminalWidget.vue'
-import { ArrowLeft, X } from 'lucide-vue-next'
 
-const router = useRouter()
 const tabsStore = useTerminalTabsStore()
 const connectionsStore = useConnectionsStore()
 
@@ -18,69 +15,16 @@ onMounted(() => {
     connectionsStore.fetchConnections()
   }
 })
-
-function handleTabClick(tabId: string) {
-  tabsStore.activate(tabId)
-}
-
-function handleTabClose(tabId: string, event: Event) {
-  event.stopPropagation()
-  tabsStore.close(tabId)
-}
-
-function goBack() {
-  router.push('/connections')
-}
 </script>
 
 <template>
   <div class="h-full flex flex-col">
-    <!-- 顶部导航栏 -->
-    <div class="flex items-center gap-4 px-4 py-3 border-b border-slate-700 bg-slate-800/50">
-      <button
-        @click="goBack"
-        class="p-2 rounded-lg text-slate-400 hover:bg-slate-700 hover:text-slate-100 transition-colors duration-200 cursor-pointer"
-        aria-label="返回"
-      >
-        <ArrowLeft class="w-5 h-5" aria-hidden="true" />
-      </button>
-      <h2 class="text-lg font-semibold text-slate-100">终端</h2>
-    </div>
-
-    <!-- 标签栏 -->
-    <div
-      v-if="tabs.length > 0"
-      class="flex items-center gap-2 px-4 py-2 border-b border-slate-700 bg-slate-900/50 overflow-x-auto"
-    >
-      <div
-        v-for="tab in tabs"
-        :key="tab.id"
-        @click="handleTabClick(tab.id)"
-        class="flex items-center gap-2 px-3 py-2 rounded-lg cursor-pointer transition-colors duration-200 whitespace-nowrap"
-        :class="tab.active ? 'bg-slate-700 text-slate-100' : 'bg-slate-800 text-slate-400 hover:bg-slate-700/50 hover:text-slate-200'"
-      >
-        <span class="text-sm font-medium">{{ tab.title }}</span>
-        <button
-          @click="(e) => handleTabClose(tab.id, e)"
-          class="p-1 rounded hover:bg-slate-600 transition-colors duration-200"
-          aria-label="关闭标签"
-        >
-          <X class="w-3 h-3" aria-hidden="true" />
-        </button>
-      </div>
-    </div>
-
     <!-- 终端内容区 -->
     <div class="flex-1 min-h-0 p-4">
       <div v-if="tabs.length === 0" class="flex items-center justify-center h-full text-slate-400">
         <div class="text-center">
-          <p class="mb-2">暂无打开的终端</p>
-          <button
-            @click="goBack"
-            class="px-4 py-2 rounded-lg bg-cyan-600 hover:bg-cyan-500 text-white transition-colors duration-200 cursor-pointer"
-          >
-            返回连接列表
-          </button>
+          <p class="text-lg mb-2">暂无打开的终端</p>
+          <p class="text-sm text-slate-500">从左侧连接列表点击"终端"按钮打开</p>
         </div>
       </div>
       <div v-else class="h-full">