feat(frontend): 新增全局服务器快捷检索并优化工作台

新增 Ctrl+Shift+F 全局服务器检索面板，支持对 SSH、
RDP、VNC 连接进行本地模糊搜索、键盘导航与直接连接，
并统一复用现有 sessionStore 连接链路

同时将 Workbench 导航从左侧竖排 icon rail 调整为标题上方
横向纯图标栏，并补充终端标签页“关闭全部”菜单项

packages/frontend/src/components/GlobalConnectionQuickSearch.vue

@@ -0,0 +1,179 @@
+<script setup lang="ts">
+import { computed, nextTick, onMounted, ref, watch } from 'vue';
+import { useI18n } from 'vue-i18n';
+import type { ConnectionInfo } from '../stores/connections.store';
+import { searchConnections } from '../utils/connectionSearch';
+
+const props = defineProps<{
+  connections: ConnectionInfo[];
+  isLoading: boolean;
+}>();
+
+const emit = defineEmits<{
+  (e: 'close'): void;
+  (e: 'select', connection: ConnectionInfo): void;
+}>();
+
+const { t } = useI18n();
+const inputRef = ref<HTMLInputElement | null>(null);
+const query = ref('');
+const selectedIndex = ref(0);
+
+const results = computed(() => searchConnections(props.connections, query.value, 8));
+
+watch(results, async (nextResults) => {
+  if (nextResults.length === 0) {
+    selectedIndex.value = -1;
+    return;
+  }
+
+  if (selectedIndex.value < 0 || selectedIndex.value >= nextResults.length) {
+    selectedIndex.value = 0;
+  }
+
+  await nextTick();
+});
+
+onMounted(async () => {
+  await nextTick();
+  inputRef.value?.focus();
+  inputRef.value?.select();
+});
+
+const close = () => emit('close');
+
+const selectResult = (index: number) => {
+  const target = results.value[index];
+  if (!target) {
+    return;
+  }
+
+  emit('select', target.connection);
+};
+
+const moveSelection = (direction: 1 | -1) => {
+  if (results.value.length === 0) {
+    return;
+  }
+
+  if (selectedIndex.value === -1) {
+    selectedIndex.value = 0;
+    return;
+  }
+
+  selectedIndex.value = (selectedIndex.value + direction + results.value.length) % results.value.length;
+};
+
+const handleKeyDown = (event: KeyboardEvent) => {
+  switch (event.key) {
+    case 'ArrowDown':
+      event.preventDefault();
+      moveSelection(1);
+      break;
+    case 'ArrowUp':
+      event.preventDefault();
+      moveSelection(-1);
+      break;
+    case 'Enter':
+      event.preventDefault();
+      if (selectedIndex.value >= 0) {
+        selectResult(selectedIndex.value);
+      }
+      break;
+    case 'Escape':
+      event.preventDefault();
+      close();
+      break;
+    default:
+      break;
+  }
+};
+
+const getConnectionLabel = (connection: ConnectionInfo): string => connection.name || connection.host;
+</script>
+
+<template>
+  <div
+    class="fixed inset-0 z-[10001] flex items-start justify-center px-4 pt-[12vh]"
+    :style="{ backgroundColor: 'var(--overlay-bg-color)' }"
+    @click.self="close"
+  >
+    <div class="w-full max-w-2xl overflow-hidden rounded-2xl border border-border bg-background shadow-2xl">
+      <div class="border-b border-border/70 px-5 py-4">
+        <div class="flex items-start justify-between gap-4">
+          <div>
+            <p class="text-xs font-semibold uppercase tracking-[0.24em] text-text-secondary">
+              {{ t('globalConnectionSearch.shortcut') }}
+            </p>
+            <h2 class="mt-1 text-xl font-semibold text-foreground">
+              {{ t('globalConnectionSearch.title') }}
+            </h2>
+          </div>
+          <button
+            type="button"
+            class="rounded-md px-2 py-1 text-sm text-text-secondary transition-colors duration-150 hover:bg-border hover:text-foreground"
+            @click="close"
+          >
+            Esc
+          </button>
+        </div>
+        <input
+          ref="inputRef"
+          v-model="query"
+          type="text"
+          class="mt-4 w-full rounded-xl border border-border/70 bg-input px-4 py-3 text-base text-foreground shadow-sm outline-none transition duration-150 ease-in-out placeholder:text-text-secondary focus:border-primary focus:ring-2 focus:ring-primary/40"
+          :placeholder="t('globalConnectionSearch.placeholder')"
+          @keydown="handleKeyDown"
+        >
+      </div>
+
+      <div class="max-h-[60vh] overflow-y-auto px-3 py-3">
+        <div v-if="isLoading && connections.length === 0" class="px-3 py-8 text-center text-sm text-text-secondary">
+          <i class="fas fa-spinner fa-spin mr-2"></i>{{ t('globalConnectionSearch.loading') }}
+        </div>
+
+        <div v-else-if="results.length === 0" class="px-3 py-8 text-center text-sm text-text-secondary">
+          <i class="fas fa-search mb-3 block text-xl"></i>
+          <p v-if="query">{{ t('globalConnectionSearch.noResults', { query }) }}</p>
+          <p v-else>{{ t('globalConnectionSearch.emptyHint') }}</p>
+        </div>
+
+        <button
+          v-for="(item, index) in results"
+          :key="item.connection.id"
+          type="button"
+          class="mb-2 flex w-full items-center gap-3 rounded-xl border px-4 py-3 text-left transition-all duration-150 last:mb-0"
+          :class="index === selectedIndex
+            ? 'border-primary/60 bg-primary/10 shadow-[0_0_0_1px_rgba(34,197,94,0.12)]'
+            : 'border-border/60 bg-header/40 hover:border-primary/30 hover:bg-primary/5'"
+          @mouseenter="selectedIndex = index"
+          @click="selectResult(index)"
+        >
+          <div class="flex h-10 w-10 flex-shrink-0 items-center justify-center rounded-full bg-primary/12 text-primary">
+            <i :class="['fas', item.connection.type === 'RDP' ? 'fa-desktop' : (item.connection.type === 'VNC' ? 'fa-plug' : 'fa-server')]"></i>
+          </div>
+
+          <div class="min-w-0 flex-1">
+            <div class="flex items-center gap-2">
+              <span class="truncate text-sm font-semibold text-foreground">
+                {{ getConnectionLabel(item.connection) }}
+              </span>
+              <span class="rounded-full bg-border px-2 py-0.5 text-[11px] font-semibold uppercase tracking-wide text-text-secondary">
+                {{ item.connection.type }}
+              </span>
+            </div>
+            <div class="mt-1 flex flex-wrap items-center gap-x-3 gap-y-1 text-xs text-text-secondary">
+              <span>{{ item.connection.host }}:{{ item.connection.port }}</span>
+              <span>{{ item.connection.username }}</span>
+            </div>
+          </div>
+        </button>
+      </div>
+
+      <div class="flex items-center justify-between border-t border-border/70 px-5 py-3 text-xs text-text-secondary">
+        <span>{{ t('globalConnectionSearch.footerHint') }}</span>
+        <span>{{ t('globalConnectionSearch.footerActions') }}</span>
+      </div>
+    </div>
+  </div>
+</template>