Tatsh / livecheck / 24704554802

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project: migrate HTTP stack from requests to niquests (async)

Replace the synchronous requests-based HTTP path with async niquests
sessions backed by niquests-cache. All heuristic-check handlers in
livecheck/special/* and their tests are ported to async/await.

Highlights:

- Add livecheck/utils/session.py with build_session and
  build_github_session helpers that wrap AsyncCachedSession with a
  shared asyncio.Semaphore for concurrency limiting, SQLite-backed
  caching, and cache-control revalidation.
- The GitHub session honours REST API rate-limit conventions:
  retry-after, x-ratelimit-remaining/reset, and 403 rate-limit bodies
  trigger bounded backoff; depleted windows park until reset.
- Rework livecheck/utils/requests.py: session_init returns an
  AsyncSession; get_content, hash_url, and get_last_modified become
  coroutines; add init_sessions and close_sessions to manage the
  module-level semaphore and session cache lifecycle.
- Update all consumers under livecheck/special/* to await HTTP calls
  and propagate async up to main.py's entry point.
- Switch the requests dependency for niquests, niquests-cache, and
  add anyio in pyproject.toml and .wiswa.jsonnet. Drop types-requests;
  add niquests-mock and pytest-asyncio to test deps. Set
  asyncio_mode = "auto" and ignore RUF029 for tests.
- Fix the yapfignore patterns: fnmatch does not treat ** as a
  recursive glob and matches paths, not directory entries, so
  `.venv/**` never pruned the walk. Use bare directory names instead.
- Rewrite tests across tests/ to use pytest-asyncio and niquests-mock,
  mocking session_init/get_content rather than the requests library.
- Refresh uv.lock for the new dependency closure.

Signed-off-by: Andrew Udvare <audvare@gmail.com>

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