Technician updater and one shared Python environment (v0.9.0)

update_windows.bat / update_macos.command: fetch release tags from Gitea,
move the folder to the newest vX.Y (git downloads only what changed),
connect a folder unpacked from a release zip on first run, install git/uv
when missing and sync the Python libraries. Developer copies on a branch
are left alone.

run_* and update_* share one environment (KotaTechnicianTool/venv)
instead of one per version.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "kota-technician-tool"
-version = "0.8.0"
+version = "0.9.0"
 description = "KOTA sensorbox technician diagnostic tool (demo)"
 requires-python = ">=3.11,<3.14"
 dependencies = [