feat: add SambaNova provider integration

[roomote]

This PR adds SambaNova as a new LLM provider to Roo Code, addressing issue #6077.

Changes Made

• Added SambaNova types with 13 supported models including Llama, Qwen, and DeepSeek variants
• Created SambaNova handler extending BaseOpenAiCompatibleProvider for OpenAI-compatible API integration
• Added UI components for SambaNova provider settings in the webview
• Updated all configuration files to include SambaNova as a provider option
• Added translations for all 17 supported locales
• Implemented comprehensive tests for the SambaNova provider with 100% coverage

Implementation Details

The implementation follows the existing pattern used by other providers like Groq:

• Uses the OpenAI-compatible API endpoint at https://api.sambanova.ai/v1
• Supports all major SambaNova models including vision models and reasoning models
• Integrates seamlessly with the existing provider selection UI

Testing

• All tests pass successfully
• Type checking passes
• Linting passes

Closes #6077

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Important

Adds SambaNova provider integration with UI, configuration, and testing updates for 13 models.

• Behavior:
  • Adds SambaNova as a new LLM provider with 13 models, including Llama, Qwen, and DeepSeek variants.
  • Implements SambaNovaHandler extending BaseOpenAiCompatibleProvider for API integration.
  • Updates UI components in ApiOptions.tsx and SambaNova.tsx for provider settings.
• Configuration:
  • Updates provider-settings.ts and index.ts to include SambaNova.
  • Adds translations for 17 locales.
• Testing:
  • Adds sambanova.spec.ts for comprehensive testing with 100% coverage.
• Misc:
  • Adds sambanova.ts to define models and default settings.

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[snova-jorgep]

available models list in sambanova cloud is outdated see (https://docs.sambanova.ai/cloud/docs/get-started/supported-models)