fix: update Claude Sonnet 4.5 model name to claude-sonnet-4-5-20250929

[roomote]

Summary

This PR attempts to address Issue #9434 by updating the Claude Sonnet 4.5 model name format from claude-sonnet-4.5 to claude-sonnet-4-5-20250929 to improve URL compatibility.

Changes

• Updated the OpenRouter default model ID from anthropic/claude-sonnet-4.5 to anthropic/claude-sonnet-4-5-20250929
• Updated model references in the prompt caching and reasoning budget model lists
• Updated all corresponding test files to use the new model ID format

Testing

• ✅ All tests pass for src/api/providers/__tests__/openrouter.spec.ts
• ✅ All tests pass for webview-ui/src/components/ui/hooks/__tests__/useSelectedModel.spec.ts

Context

As reported in #9434, many URLs fail to recognize the dot notation format (claude-sonnet-4.5). This change updates to the hyphen-separated format with date suffix (claude-sonnet-4-5-20250929) which is more widely compatible.

Fixes #9434

Feedback and guidance are welcome!

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Important

Update Claude Sonnet 4.5 model name to claude-sonnet-4-5-20250929 for improved URL compatibility.

• Behavior:
  • Update model name from claude-sonnet-4.5 to claude-sonnet-4-5-20250929 for URL compatibility.
  • Affects openRouterDefaultModelId, OPEN_ROUTER_PROMPT_CACHING_MODELS, and OPEN_ROUTER_REASONING_BUDGET_MODELS in openrouter.ts.
• Testing:
  • Update tests in openrouter.spec.ts to use new model ID.
  • Update tests in useSelectedModel.spec.ts to use new model ID.
• Context:
  • Addresses Issue [ENHANCEMENT] claude-sonnet-4.5 #9434 by changing model name format to hyphen-separated with date suffix.

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[roomote]

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Review completed. No issues found - changes look good!

The PR successfully updates the OpenRouter Claude Sonnet 4.5 model name from claude-sonnet-4.5 to claude-sonnet-4-5-20250929 to improve URL compatibility. All references have been properly updated across the codebase and test files.

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