fix(anthropic): drop invalid name field from output_config.format

[adilson0888]

Fixes #32.

Problem

Structured-output requests (response_format.json_schema on /v1/chat/completions, text.format on /v1/responses) to the anthropic provider fail outright against the live Anthropic API:

{"error":{"message":"output_config.format.name: Extra inputs are not permitted","type":"invalid_request_error"}}

Anthropic's Messages API output_config.format only accepts { type, schema }. The translator was carrying over an OpenAI-style name field (valid on OpenAI's json_schema.name/text.format.name, not on Anthropic's shape) into the Anthropic request body, and Anthropic's strict validation rejects the unrecognized field.

Fix

Drops name from both call sites that build output_config.format for Anthropic:

• openaiToAnthropic (Chat Completions → Anthropic)
• responsesToAnthropic (Responses API → Anthropic)

No other fields change. The equivalent OpenAI-Responses-shaped path (chatToResponsesRequest, text.format.name) is untouched — that field is correct there, it's a different upstream (OpenAI) with a different accepted shape.

Also fixes a stale unit test that had asserted the buggy behavior (result.output_config.format.name === "test").

Verification

• Reproduced the original 400 against the live Anthropic API via a real Karakeep auto-tagging request (claude-haiku-4-5, /v1/chat/completions with response_format.json_schema).
• Applied this exact fix, rebuilt, redeployed — same request now returns a real completion instead of a 400.
• Confirmed end-to-end with Karakeep's actual auto-tagging feature working against the patched build.
• Full test suite passes: npm test → 200/200.

Notes

I initially mis-diagnosed this and tried renaming the field to output_format" — Anthropic's own error message corrected that ("This field is deprecated. Use 'output_config.format' instead"), confirming output_config.formatis the current wrapper and the sole problem is the extraname` key inside it. Mentioning in case anyone else goes down the same wrong path from the error text.