功能：新增云管API与Web控制台并完成现场接入

console/src/composables/useTheme.ts

@@ -0,0 +1,19 @@
+import { computed, ref } from 'vue'
+
+const key = 'vdi.theme'
+const saved = (() => { try { return localStorage.getItem(key) } catch { return null } })()
+const theme = ref<'dark' | 'light'>(saved === 'light' ? 'light' : 'dark')
+function apply() {
+  document.documentElement.dataset.theme = theme.value
+  document.documentElement.style.colorScheme = theme.value
+}
+apply()
+export function useTheme() {
+  const dark = computed(() => theme.value === 'dark')
+  function toggle() {
+    theme.value = dark.value ? 'light' : 'dark'
+    apply()
+    try { localStorage.setItem(key, theme.value) } catch { /* The theme still works without browser storage. */ }
+  }
+  return { theme, dark, toggle }
+}