Refactor timeout and body handling to use match statements

[adamtheturtle]

Summary

• Replace isinstance chains with match/case for timeout normalization and request body → bytes conversion in _wrap_callback

Closes #3110

Test plan

• All pre-commit hooks pass
• Existing tests pass (no behavioral changes)

🤖 Generated with Claude Code

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Note

Low Risk
Pure refactor of request timeout and body parsing in the mock callback wrapper; low risk aside from potential edge-case differences when timeout tuples or unusual body types are passed.

Overview
Refactors _wrap_callback in src/mock_vws/_requests_mock_server/decorators.py to replace isinstance chains with match/case for (1) normalizing requests timeout values (including (connect, read) tuples) into an effective read-timeout and (2) converting request.body into bytes.

Behavior is intended to stay the same, but tuple handling is now pattern-matched (only treating (…, number) as a read timeout) and body handling is expressed via explicit None/str cases with a fallback to the original body value.

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