* feat(providers): add LongCat model provider support
Add LongCat as an OpenAI-compatible provider with base URL
https://api.longcat.chat/openai and default model LongCat-Flash-Thinking.
Includes provider config, migration, factory routing, example config,
tests, and README entries for all 6 locales.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
* fix(providers): address LongCat review feedback
- Add dedicated factory routing test for LongCat provider
- Add longcat to DefaultAPIBase test coverage
- Set default api_base in example config providers section
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
* test(providers): add ResolveProviderSelection tests for LongCat
Add two test cases to TestResolveProviderSelection:
- Explicit provider selection with api_base default and proxy wiring
- Fallback inference from model name with api_base default
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Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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