Alexander Davydov 5629ad8360 feat: add GigaChat provider — streaming, auth, and onboarding
Add native GigaChat provider support with:

- Custom SSE streaming with schema cleaning, retry logic, and error
  extraction (src/agents/gigachat-stream.ts)
- OAuth (personal/business) and Basic auth onboarding flows
- Provider-specific config stored in auth profile credential metadata
  (not in ModelProviderConfig), keeping core types untouched
- GigaChat model definitions, env var mappings, and CLI flags
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