Add the option to use a custom Host header for openai-compatible

[mrubens]

#2392

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Important

This PR adds support for custom Host headers and legacy format options for OpenAI-compatible models, updating API handling, configuration settings, and UI components.

• Behavior:
  • Adds support for custom Host header in OpenAiHandler in openai.ts and getOpenAiModels().
  • Introduces openAiLegacyFormat option in OpenAiHandler to handle legacy format for message conversion.
• Configuration:
  • Adds openAiHostHeader and openAiLegacyFormat to ProviderSettings in types.ts and roo-code.d.ts.
  • Updates providerSettingsSchema in schemas/index.ts to include new options.
• UI:
  • Updates ApiOptions.tsx to include checkboxes for openAiHostHeader and openAiLegacyFormat.
  • Adds translations for new settings in multiple locale files.

^{This description was created by for dd60283. It will automatically update as commits are pushed.}

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Latest commit: dd60283

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