feat: initial QNAP QTS driver scaffold

QTS is a Linux distribution, so the driver inherits the OS surface from
LinuxDriver and adds QNAP's storage, QPKG and virtualisation layers.

What is here: the class with its discovery fingerprints, per-session
detection of the QTS major version and of the QPKG-local docker and virsh
binaries, and explicit resolution of the MRO collisions that StorageDriver
creates over LinuxDriver.

What is not: the storage, QPKG and VM parsers. Those need real command
output from QTS 4 and QTS 5 hardware to be written against, which is what
tools/harvest.sh collects and tools/sanitize.py anonymises. Two tests are
marked xfail(strict) as the specification for that work.

.gitignore

@@ -0,0 +1,13 @@
+__pycache__/
+*.py[cod]
+*.egg-info/
+build/
+dist/
+.venv/
+.pytest_cache/
+.mypy_cache/
+.ruff_cache/
+.coverage
+htmlcov/
+# Raw, unsanitised harvest output — never commit device data.
+tools/harvest-out/