Use sync clients in respx transport tests

[adamtheturtle]

Convert tests/mock_vws/test_respx_mock_usage.py from async vws clients to synchronous VWS, CloudRecoService, and VuMarkService usage. Inject HTTPXTransport() so the tests still exercise the respx/httpx interception path while removing asyncio.run, async with, and await. Verified with uv run --extra dev pytest tests/mock_vws/test_respx_mock_usage.py -q (5 passed).

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Note

Low Risk
Test-only refactor switching from async to sync client APIs while keeping the same mocked HTTPX/respx interception path; low blast radius outside of potential test behavior differences (timeouts/context management).

Overview
Updates the MockVWS/respx transport tests to use synchronous vws clients (VWS, CloudRecoService, VuMarkService) instead of async variants.

Removes asyncio.run, async with, and await, and explicitly injects HTTPXTransport() so requests still flow through the httpx interception path while exercising the same timeout, base-URL-prefix, target lifecycle, query, and VuMark image generation scenarios.

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