fix(llm): let an interrogation use the credential its route already stored
A configuration surface never holds a stored secret — it edits a redacted descriptor — so once a key is saved, the draft it sends carries the route and the endpoint and no credential at all. The interrogation went out unauthenticated and the endpoint's 401 came back as "check the API key", pointing at the one thing that was fine. A named route now supplies its own credential, resolved exactly as a request to it would be. A key typed into the form still wins: it is the one under test, and may be the replacement for the stored one that is failing. Resolution is a callback the probe invokes past the catalog short-circuit and the protocol check, so a route answered from the installed registry costs no credential lookup — and cannot fail over a credential the question never needed.
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@@ -85,6 +85,8 @@ profile 的 `models` 列表是*替换*该路由已安装 catalog,而不是扩
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点名了**已安装 catalog 所提供路由**的请求,直接由该 catalog 作答,完全不联网:pi-ai 的注册表才是它自家提供方的权威列表,且携带列表端点不会公布的上下文窗口与输出上限。这类路由根本不需要 `baseURL`。只有 catalog 未描述的路由——网关、自建服务——才会经协议层询问;若它也没给端点,则会被告知去设置一个或手工填写模型。
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草稿携带的是用户当下键入的凭据(如果有);已经存好凭据的路由,在配置界面上只呈现一个脱敏描述符,因此询问会自行取用该路由的凭据——解析方式与向它发请求时完全一致,先 `apiKey` 后 `apiKeyEnv`——而不是不带认证发出去、再把端点的 401 报成密钥不对。键入的密钥优先,因为那正是被测试的那一把。解析只发生在真正要联网的路径上,因此 catalog 路由作答时完全不会触碰凭据。
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询问只读 `openai-completions` 与 `openai-responses`,它们「`GET /models` + bearer 认证」的形状是网关、自建服务与官方端点三方一致认可的那一种。Azure 尽管出身 OpenAI 也被排除——它用 `api-key` 标头认证并要求 `api-version` 查询参数——Codex 则走 OAuth;其余协议一律以 `DISCOVERY_UNSUPPORTED` 回答,让界面回退到手工填写,而不是把认证失败报成一个没有模型的提供方。`baseURL` 按前缀而非待解析 URL 处理,因此 `https://gateway.example/openai/v1` 这类部署路径会保留其路径段。
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多数列表只公布 id;`context_window`/`context_length` 与 `max_output_tokens`/`max_tokens` 在网关提供时会被读取,没有可用 id 的条目会被跳过而不是让整份列表失败,其余仍由采纳方补齐。回复在四兆字节上限下读取,且上限落在实际收到的字节上——端点是用户自己填的 URL,因此会先看声明长度,但绝不把它当作边界。端点不可达、凭据被拒、响应非 JSON、以及响应没有 `data` 数组,都会以 `DISCOVERY_FAILED` 失败,消息点名端点;仅当 401 或 403 时才点名凭据。读取响应体期间被取消会呈现为 `ABORTED`,与请求发出之前被取消一致。
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