fix: discover configured gateway model catalog

[seonghobae]

Problem

A trusted bootstrap could provide LLM_GATEWAY_API_URL / LLM_GATEWAY_URL and LLM_GATEWAY_API_KEY, but those settings were not connected to a ProviderModelSource. Standard /v1/models also omits the richer price and capability fields available from LiteLLM model info.

Fix

• Build one OpenAI-compatible discovery source only when its HTTPS hostname is explicitly allowlisted.
• Promote the one-shot environment key into KV; runtime discovery reads it through get_credential.
• Join safe model-info fields by logical model name: mode, vision input, and complete consistent input/output token prices. Internal upstream URLs, credentials, and deployment identifiers are discarded.
• Preserve paid, unknown-price, and structured zero-price models. Conflicting deployment prices remain unknown.
• Retry only certificate-verification failures with certifi trust while retaining hostname and certificate verification.

Evidence

• Focused discovery tests: 51 passed after model-info integration.
• Live configured-gateway verification: eight models discovered, seven chat prices registered, embedding capability preserved, and zero provider errors.
• Generic fixture proves structured zero-price chat models remain in the full catalog and enter the free tier.

Stacked on #868, which defines orchestrator/auto, orchestrator/free, gateway-default, and omitted-model serving semantics.

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[devin-ai-integration]

Devin Review found 1 new potential issue.