Collin e8dea7d456 Add provider classification and upstream-error tests ...

ROADMAP "Backend → more tests around endpoint probing and provider setup"
and the "Provider setup/probing audit" item. test_provider_endpoints.py
covers URL/header building; this adds the provider-identification and
degraded-state error reporting around it, against the real src.llm_core:

- _detect_provider: host-based (not substring) provider matching, with
  look-alike-host and domain-in-path guards, and the OpenAI-compatible
  fallback that xAI / DeepSeek / Gemini correctly use.
- _provider_label: human names used in error messages (incl. native vs
  cloud Ollama and the generic local-endpoint case).
- _format_upstream_error: 401/403/404/429/5xx → provider-aware sentences,
  with JSON / string / plain-text / bytes body detail extraction.
- _uses_max_completion_tokens: gpt-5 / o-series detection (gpt-4o stays
  on plain max_tokens).

2026-06-02 20:42:43 +09:00

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