feat(claude): add custom baseURL support for Anthropic provider

[MarsKubeX]

Allow users to configure a custom base URL when creating a Claude provider connection, enabling local inference engines (e.g. llama-server) and API proxies. Connections with a custom URL are registered as self-hosted with the endpoint exposed in the model ID.

Not merge until openkaiden/kdn#543 is merged.
Close #1855

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📥 Commits

Reviewing files that changed from the base of the PR and between b23d597 and 7eea537.

📒 Files selected for processing (3)

• extensions/claude/package.json
• extensions/claude/src/manager/claude-inference-manager.spec.ts
• extensions/claude/src/manager/claude-inference-manager.ts

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[codecov]

Codecov Report

❌ Patch coverage is 93.61702% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...ons/claude/src/manager/claude-inference-manager.ts	93.61%	3 Missing ⚠️

📢 Thoughts on this report? Let us know!

[jeffmaury]

Blocking for now as we need to decide if we should be backward compatible

[MarsKubeX]

closed in favor of #2094