fix(auth): 为登录链路增加有界超时

为 PostgreSQL 连接、就绪检查和本地登录设置分层超时，数据库不可用时返回稳定 503 错误码并记录无凭据的连接池统计。

前端登录在 10 秒后取消请求并兼容调用方 AbortSignal，Nginx 登录精确路由限制上游为 15 秒，同时更新 OpenAPI 和回归测试。

apps/web/src/api.ts

@@ -121,6 +121,7 @@ export async function loginLocalAccount(input: { account: string; password: stri
     auth: false,
     body: input,
     method: 'POST',
+    timeoutMs: 10_000,
   });
 }
 
@@ -1206,7 +1207,7 @@ export async function deleteFileStorageChannel(token: string, channelId: string)
 
 async function request<T>(
   path: string,
-  options: { token?: string; auth?: boolean; method?: string; body?: unknown; headers?: Record<string, string>; signal?: AbortSignal } = {},
+  options: { token?: string; auth?: boolean; method?: string; body?: unknown; headers?: Record<string, string>; signal?: AbortSignal; timeoutMs?: number } = {},
 ): Promise<T> {
   const headers: Record<string, string> = { ...(options.headers ?? {}) };
   if (options.auth !== false && options.token && options.token !== OIDC_BROWSER_SESSION_CREDENTIAL) {
@@ -1215,21 +1216,35 @@ async function request<T>(
   if (options.body !== undefined) {
     headers['Content-Type'] = 'application/json';
   }
-  const response = await fetch(`${API_BASE}${path}`, {
-    method: options.method ?? 'GET',
-    headers,
-    body: options.body === undefined ? undefined : JSON.stringify(options.body),
-    credentials: 'include',
-    signal: options.signal,
-  });
-  if (!response.ok) {
-    const body = await response.text();
-    throw new GatewayApiError(parseErrorDetails(body, response.status, `Request failed: ${response.status}`));
+  const controller = options.timeoutMs ? new AbortController() : undefined;
+  const timeout = controller ? globalThis.setTimeout(() => controller.abort(), options.timeoutMs) : undefined;
+  const signal = controller && options.signal
+    ? AbortSignal.any([controller.signal, options.signal])
+    : controller?.signal ?? options.signal;
+  try {
+    const response = await fetch(`${API_BASE}${path}`, {
+      method: options.method ?? 'GET',
+      headers,
+      body: options.body === undefined ? undefined : JSON.stringify(options.body),
+      credentials: 'include',
+      signal,
+    });
+    if (!response.ok) {
+      const body = await response.text();
+      throw new GatewayApiError(parseErrorDetails(body, response.status, `Request failed: ${response.status}`));
+    }
+    if (response.status === 204) {
+      return undefined as T;
+    }
+    return response.json() as Promise<T>;
+  } catch (error) {
+    if (controller?.signal.aborted) {
+      throw new GatewayApiError('登录请求超时，请稍后重试');
+    }
+    throw error;
+  } finally {
+    if (timeout !== undefined) globalThis.clearTimeout(timeout);
   }
-  if (response.status === 204) {
-    return undefined as T;
-  }
-  return response.json() as Promise<T>;
 }
 
 function authorizationHeader(token: string): Record<string, string> {