fix(web): 生产(mock 禁用)不再弹 dev "快速登录"框,改提示走宿主 SSO

之前 auth-gate 在"非嵌入+未登录"时强制弹 MockLoginDialog(预设瑞尔/瑞泰硬编码前端),
真生产 PAC_ENABLE_MOCK_LOGIN=false 时框照弹、点了才 10107 报错,体验很怪。
改:探测后端 GET /auth/mock-users(禁用返空)→ mock 禁用时显示 SessionExpired
(请从宿主进入),不弹快速登录框;dev/试部署(mock 开)行为不变。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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