fix: NetEase API端口冲突检查，Settings页面create-bot样式修复

- NetEase API启动前检查端口是否被占用（与QQ API相同逻辑）
- 添加.create-bot CSS（分隔线+间距）
- 防止EADDRINUSE崩溃

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/music/api-server.ts

@@ -40,6 +40,13 @@ export function createApiServerManager(
 
       // Start NetEase Cloud Music API
       try {
+        const portFree = await isPortFree(options.neteasePort);
+        if (!portFree) {
+          logger.info(
+            { port: options.neteasePort },
+            "NetEase API port already in use — reusing existing instance"
+          );
+        } else {
           const ncmModule = await import("NeteaseCloudMusicApi") as any;
           const serverObj = ncmModule.server ?? ncmModule.default?.server;
           const app = await serverObj.serveNcmApi({ port: options.neteasePort });
@@ -48,6 +55,7 @@ export function createApiServerManager(
             { port: options.neteasePort },
             "NetEase Cloud Music API started"
           );
+        }
       } catch (err) {
         logger.error({ err }, "Failed to start NetEase Cloud Music API");
       }

web/src/views/Settings.vue

@@ -1001,6 +1001,12 @@ onUnmounted(() => {
   align-items: center;
 }
 
+.create-bot {
+  margin-top: 20px;
+  padding-top: 16px;
+  border-top: 1px solid var(--border-color);
+}
+
 .form-group {
   margin-bottom: 12px;
   label {