fix(admin+server): 酷狗 baseUrl 默认值移除 127.0.0.1 + 新增后台配置入口与推荐快捷地址

问题：容器内 SystemSettings.kugouApiBaseUrl 默认 http://127.0.0.1:3000 指向自己，sidecar 不可达。

修复：1) schema + migration 移除 kugouApiBaseUrl 默认值；kugouService + status API 兜底改空串（不再假设有 localhost），优先级 env(KUGOU_API_BASE) > DB。

2) 新增 POST /api/admin/kugou/settings：ADMIN+/SUPER 即时写 kugouApiBaseUrl 入库+刷新 CacheService。

3) KuGouImporter.client.vue 左栏新增 baseUrl 输入框（回车即存）+ 保存并测试按钮 + 两个推荐快捷按钮（容器宿主 http://172.19.0.1:3000、公网中继 https://bywmusic.bzw-hheb.top/kugou）+ 当前生效地址显式提示。

4) UI/Icon.vue 新增 server / globe / save 三个 SVG 图标与上述入口配套。

app/components/Admin/KuGouImporter.client.vue

@@ -70,7 +70,55 @@
             <LoadingState :height="72" />
           </div>
 
-          <div class="mt-5 space-y-3">
+          <div class="mt-5 space-y-4">
+            <!-- baseUrl 配置 -->
+            <div class="rounded-xl border border-zinc-200 bg-zinc-50 p-4 space-y-3">
+              <div class="flex items-center justify-between">
+                <label class="text-[11px] font-black uppercase tracking-wider text-zinc-600">
+                  KuGouMusicApi 地址
+                </label>
+                <span
+                  v-if="baseUrlSaving"
+                  class="text-[11px] text-zinc-500"
+                >保存中...</span>
+                <span
+                  v-else-if="baseUrlSavedTick"
+                  class="text-[11px] text-emerald-600 font-bold"
+                >已保存</span>
+              </div>
+              <input
+                v-model="baseUrlInput"
+                type="url"
+                placeholder="例：http://172.19.0.1:3000 或 https://bywmusic.bzw-hheb.top/kugou，留空则走环境变量 KUGOU_API_BASE"
+                class="w-full h-[42px] px-3 rounded-xl border border-zinc-200 bg-white text-[12px] text-zinc-900 placeholder:text-zinc-400 focus:outline-none focus:ring-2 focus:ring-indigo-500/40 focus:border-indigo-400"
+                @keydown.enter="saveBaseUrl"
+              />
+              <div class="flex flex-wrap gap-2">
+                <button
+                  class="h-[34px] px-3 rounded-lg text-[11px] font-bold bg-white hover:bg-zinc-100 border border-zinc-200 text-zinc-700 transition-colors inline-flex items-center gap-1"
+                  @click="baseUrlInput = 'http://172.19.0.1:3000'"
+                >
+                  <Icon name="server" :size="13" /> 容器直连宿主 http://172.19.0.1:3000
+                </button>
+                <button
+                  class="h-[34px] px-3 rounded-lg text-[11px] font-bold bg-white hover:bg-zinc-100 border border-zinc-200 text-zinc-700 transition-colors inline-flex items-center gap-1"
+                  @click="baseUrlInput = 'https://bywmusic.bzw-hheb.top/kugou'"
+                >
+                  <Icon name="globe" :size="13" /> 中继 https://bywmusic.bzw-hheb.top/kugou
+                </button>
+                <button
+                  class="h-[34px] px-3 rounded-lg text-[11px] font-bold bg-zinc-900 hover:bg-zinc-800 text-white transition-colors inline-flex items-center gap-1"
+                  @click="saveBaseUrl"
+                  :disabled="baseUrlSaving"
+                >
+                  <Icon name="save" :size="13" /> 保存并测试
+                </button>
+              </div>
+              <p v-if="status?.service?.baseUrl" class="text-[11px] text-zinc-500 leading-relaxed">
+                当前生效地址：<code class="px-1.5 py-0.5 rounded-md bg-white border border-zinc-200 text-zinc-700 font-mono">{{ status.service.baseUrl }}</code>
+              </p>
+            </div>
+
             <div class="flex gap-2">
               <button
                 class="flex-1 h-[44px] px-3 rounded-xl text-[12px] font-bold bg-zinc-100 hover:bg-zinc-200 text-zinc-700 transition-colors flex items-center justify-center gap-1.5"
@@ -379,6 +427,9 @@ const qrContext = ref<any>(null)
 const qrHint = ref('')
 const qrState = ref<number>(0)
 const qrPollTimer = ref<any>(null)
+const baseUrlInput = ref('')
+const baseUrlSaving = ref(false)
+const baseUrlSavedTick = ref(0)
 
 const totalLoadedSongs = computed(
   () => Object.values(schedulesByDate.value).reduce((n, arr) => n + arr.length, 0),
@@ -436,11 +487,38 @@ async function reloadStatus() {
   try {
     const r = await $fetch('/api/admin/kugou/status', { ...auth.getAuthConfig() })
     status.value = r
+    if (r?.service?.baseUrl && !baseUrlInput.value) {
+      baseUrlInput.value = r.service.baseUrl
+    }
   } catch (e: any) {
     toast.show?.(e?.message || '状态刷新失败', 'error')
   }
 }
 
+async function saveBaseUrl() {
+  const value = (baseUrlInput.value || '').trim()
+  if (value && !/^https?:\/\//i.test(value)) {
+    toast.show?.('请填写合法的 http(s) URL，或留空走环境变量 KUGOU_API_BASE', 'error')
+    return
+  }
+  baseUrlSaving.value = true
+  baseUrlSavedTick.value = 0
+  try {
+    await $fetch('/api/admin/kugou/settings', {
+      method: 'POST',
+      ...auth.getAuthConfig(),
+      body: { kugouApiBaseUrl: value || null },
+    })
+    toast.show?.('地址已保存', 'success')
+    baseUrlSavedTick.value = Date.now()
+    await reloadStatus()
+  } catch (e: any) {
+    toast.show?.(e?.message || '保存失败', 'error')
+  } finally {
+    baseUrlSaving.value = false
+  }
+}
+
 async function startQrLogin() {
   qrLoading.value = true
   qrOpen.value = true