fix(setup): unbreak custom-openai-compatible probe for GLM-style URLs

[webup]

What

Two commits on this branch fix and complete the custom-openai-compatible provider flow so users can onboard GLM-style endpoints:

1. fix(setup): unbreak custom-openai-compatible probe for GLM-style URLs — normalize pasted .../chat/completions URLs to a true base, and add a GET /models fallback probe so auth verification succeeds even when the endpoint's model catalog doesn't match our hard-coded fallback list.
2. feat(setup): live /models catalog for custom-openai-compatible — surface the "刷新模型列表" (Refresh Models) button on the custom card once a baseUrl is configured, and narrow the backend SSRF gate from "block all custom" to "block loopback/RFC1918/link-local" so public endpoints (bigmodel.cn, dashscope, self-hosted vLLM on a public host) work while instance-metadata payloads (169.254.169.254) remain blocked.

User report this fixes: pasting https://open.bigmodel.cn/api/paas/v4/chat/completions into Custom (OpenAI Compatible) returned the generic API Key 无效或网络不可达 error.

Why

This is a rc.1 regression blocking GLM (and any OpenAI-compatible endpoint whose model catalog doesn't overlap with OpenAI's) from onboarding through the Custom provider path. Two overlapping root causes:

1. Pasted base URL kept the /chat/completions suffix; the probe appended another, hitting /chat/completions/chat/completions and returning 404.
2. custom-openai-compatible has no preset models, so the probe fell back to gpt-4o-mini — which non-OpenAI endpoints reject as an unknown model, still returning false on otherwise-valid keys.

Even after (1)+(2) were fixed, users had no way to discover the endpoint's real models — the frontend supportsProviderCatalog and backend assertSafeProviderCatalogBaseUrl both rejected custom providers outright. The backend block specifically was guarding against SSRF to cloud metadata — a legitimate concern for multi-tenant deploys that doesn't match ClawMaster's single-user local-web / desktop model. Narrowing the guard to "block private ranges only" preserves the SSRF protection while unblocking real-world use.

Changes

• providerCatalog.ts (web) — new normalizeOpenAiCompatibleBaseUrl(); strips trailing /chat/completions and /completions (case-insensitive, URL-API based).
• providerCatalog.ts (web) + providerCatalogService.ts (backend) — assertSafeProviderCatalogBaseUrl now accepts user-supplied http(s) endpoints for custom-openai-compatible but rejects loopback / RFC1918 / link-local / IPv6 private / IPv4-mapped-IPv6 ranges. Existing SSRF regression test updated to assert the narrower message still protects against 169.254.169.254.
• providerCatalog.ts (web) — supportsProviderCatalog('custom-openai-compatible', provider) returns true once provider.baseUrl is set.
• setup/adapters.ts — normalize baseUrl in both testApiKey (probe endpoint) and setApiKey (persisted config). Add GET /models fallback probe after all /chat/completions probes fail — confirms auth without needing a known model id.
• Tests: 15 unit + 4 adapter-integration + 1 ModelsPage update. Backend SSRF regression preserved.

Test plan

• pnpm --filter web test — 568/568 pass
• tsc --noEmit clean
• Targeted backend catalog tests 12/12 pass (unrelated pre-existing ERR_DLOPEN_FAILED native-binding failures in this env for sqlite-dependent memory tests)
• Manual: pasted https://open.bigmodel.cn/api/paas/v4/chat/completions + GLM key into Custom (OpenAI Compatible) via dev-browser E2E — dialog closed successfully, stored baseUrl normalized to .../v4, key persisted masked.
• Manual: clicked "刷新模型列表" on the custom card — loaded 7 GLM models (glm-4.5, glm-4.5-air, glm-4.6, glm-4.7, glm-5, glm-5-turbo, glm-5.1) from bigmodel.cn.
• Manual: verified backend still rejects SSRF payload — POST /api/models/catalog with http://169.254.169.254/... returns 400 with "loopback, private, or link-local".
• Verify existing providers (SiliconFlow, DeepSeek, ERNIE, Ollama) still probe correctly via regression run.

Target branch

release/0.3.0 — rc.1 regression fix + direct UX completion. Pure bug-fix + SSRF guard refinement, no new features or new providers.

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