Add asyncio support with async client classes

[adamtheturtle]

Summary

Implements full asyncio support for the vws-python library. Adds three new async client classes (AsyncVWS, AsyncCloudRecoService, AsyncVuMarkService) that mirror their synchronous counterparts. Introduces AsyncTransport protocol and AsyncHTTPXTransport using httpx.AsyncClient, enabling async/await workflows in applications like FastAPI.

Changes

• New async request helper (_async_vws_request.py)
• Three new async client classes with complete feature parity
• Transport abstraction with async variant (AsyncTransport protocol, AsyncHTTPXTransport)
• 99 new async integration tests with exception coverage
• Updated exports, documentation, and dependencies (pytest-asyncio)

Testing

All 287 tests pass (188 sync + 99 async). Strict validation: mypy, ruff, pylint, pyright all pass with zero errors.

🤖 Generated with Claude Code

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Note

Medium Risk
Adds a large new async API surface (clients + transport) and resource-lifecycle behavior (aclose/async context managers) without changing existing sync clients. Risk is mainly around async request correctness, transport compatibility, and ensuring no regressions in shared response/exception handling.

Overview
Adds full asyncio support by introducing new async client classes (AsyncVWS, AsyncCloudRecoService, AsyncVuMarkService) plus a shared authenticated request helper (_async_vws_request.py) to mirror the existing sync APIs.

Introduces an async transport abstraction (AsyncTransport) and default implementation (AsyncHTTPXTransport using httpx.AsyncClient), exports the new async clients from vws.__init__, and updates Sphinx API docs to include the new modules.

Expands the test suite with async fixtures and comprehensive async integration/exception/transport tests (via pytest-asyncio), and updates tooling config (spelling dict, vulture ignore list) accordingly.

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