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。

server/api/admin/kugou/settings.post.ts

@@ -0,0 +1,37 @@
+import { eq } from 'drizzle-orm'
+import { db } from '~/drizzle/db'
+import { systemSettings } from '~/drizzle/schema'
+import { CacheService } from '~~/server/services/cacheService'
+
+export default defineEventHandler(async (event) => {
+  const user = event.context.user
+  if (!user) throw createError({ statusCode: 401, message: '未登录' })
+  if (!['ADMIN', 'SUPER_ADMIN'].includes(user.role))
+    throw createError({ statusCode: 403, message: '仅管理员可修改酷狗配置' })
+
+  const body = await readBody(event)
+  const baseUrl = String(body?.kugouApiBaseUrl || '').trim()
+
+  if (baseUrl && !/^https?:\/\//i.test(baseUrl)) {
+    throw createError({ statusCode: 400, message: 'kugouApiBaseUrl 需要是合法的 http(s) URL，留空表示禁用 sidecar' })
+  }
+
+  const rows = await db.select().from(systemSettings).limit(1)
+  const patch: Record<string, any> = {
+    kugouApiBaseUrl: baseUrl || null,
+    updatedAt: new Date(),
+  }
+
+  if (!rows[0]) {
+    await db.insert(systemSettings).values(patch)
+  } else {
+    await db.update(systemSettings).set(patch).where(eq(systemSettings.id, rows[0].id))
+  }
+
+  try {
+    const cs = CacheService.getInstance()
+    await cs.setSystemSettings?.({ ...(rows[0] || {}), ...patch })
+  } catch {}
+
+  return { ok: true, kugouApiBaseUrl: baseUrl || null }
+})

server/api/admin/kugou/status.get.ts

@@ -17,7 +17,7 @@ export default defineEventHandler(async (event) => {
 
   const rows = await db.select().from(systemSettings).limit(1)
   const settings = rows[0] as any
-  const usedBase = base || settings?.kugouApiBaseUrl || process.env.KUGOU_API_BASE || 'http://127.0.0.1:3000'
+  const usedBase = base || settings?.kugouApiBaseUrl || process.env.KUGOU_API_BASE || ''
 
   let serviceOk: boolean
   let serviceMessage: string

server/api/admin/kugou/unbind.post.ts

@@ -23,6 +23,6 @@ export default defineEventHandler(async (event) => {
   try {
     const cs = CacheService.getInstance()
     if (rows[0]) await cs.setSystemSettings?.({ ...rows[0], ...patch })
-  } catch (_) {}
+  } catch {}
   return { ok: true }
 })