fix(sites): Cloudflare 挑战不算凭据错误(CF-2)

- http.ts:cf-mitigated: challenge 或 403/503/429 挑战页 → SiteError(challenge),503 不再算维护、403 不再落到 auth_invalid
- 挑战页分类 classifyChallengePage:自动 / 可点(Turnstile)/ 真验证码
- 刷新登录 / 用户数据遇 Cloudflare 挑战只记 last_error,账号状态不变、不开登录失效事项

Co-Authored-By: Claude Opus 5.5 <[email protected]>

apps/server/src/modules/sources-identity/service/account.ts

@@ -688,8 +688,9 @@ async function markFailure(
 ): Promise<SiteLoginResult> {
   const now = rt.now();
   const lastError = { reason, message: message.slice(0, 300), at: now.toISOString() };
+  // Cloudflare 挑战(CF-2)不是凭据问题:账号状态不变、不开"登录失效"事项;过挑战由 Cloudflare 处理负责,需要人时它开事项
   const status =
-    reason === "network" || reason === "unsupported"
+    reason === "network" || reason === "unsupported" || reason === "challenge"
       ? null
       : reason === "auth_expired" && acc.auth_kind === "api_key"
         ? "invalid"