Add MODELS_BY_PROVIDER for use in @roo-code/cloud

[cte]

This will prevent us from having to bump @roo-code/cloud every time a new provider is added.

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Important

Adds MODELS_BY_PROVIDER in provider-settings.ts to map providers to models, refactors imports, and updates package version.

• New Feature:
  • Adds MODELS_BY_PROVIDER in provider-settings.ts to map providers to their models, excluding certain providers like fake-ai and openai.
• Refactoring:
  • Refactors imports in provider-settings.ts and index.ts to include new models and providers such as doubao, featherless, and fireworks.
• Misc:
  • Updates version in package.metadata.json from 1.55.0 to 1.59.0.
  • Moves BEDROCK_CLAUDE_SONNET_4_MODEL_ID to bedrock.ts.

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