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>

update_windows.bat

@@ -0,0 +1,107 @@
+@echo off
+rem KOTA Sensorbox Technician Tool - update to the newest released version.
+rem Checks Gitea for the newest release tag (vX.Y) and downloads only what changed (git).
+rem Works in a git clone and in a folder unpacked from a release zip (it is connected on first run).
+setlocal EnableDelayedExpansion
+cd /d "%~dp0"
+title KOTA Technician Tool - update
+
+if not defined KOTA_REPO_URL set "KOTA_REPO_URL=https://gitea.kota-app.com/kkallas/kota-technician-tool.git"
+set "UV_PROJECT_ENVIRONMENT=%LOCALAPPDATA%\KotaTechnicianTool\venv"
+set "PATH=%USERPROFILE%\.local\bin;%ProgramFiles%\Git\cmd;%PATH%"
+
+rem ---- git ----------------------------------------------------------------
+where git >nul 2>nul
+if errorlevel 1 (
+    echo Git is not installed. It is needed to download updates.
+    choice /m "Install Git for Windows now"
+    if errorlevel 2 goto :fail
+    winget install --id Git.Git -e --source winget --accept-package-agreements
+    where git >nul 2>nul
+    if errorlevel 1 (
+        echo [!] Git installation failed. Install it from https://git-scm.com and run this again.
+        goto :fail
+    )
+)
+
+rem ---- connect a folder unpacked from a zip ---------------------------------
+if not exist ".git" (
+    echo Connecting this folder to %KOTA_REPO_URL% ...
+    git init -q || goto :fail
+    git remote add origin "%KOTA_REPO_URL%" || goto :fail
+)
+
+rem A developer copy follows a branch; it is updated with "git pull", not here.
+git rev-parse -q --verify HEAD >nul 2>nul
+if not errorlevel 1 (
+    for /f "delims=" %%b in ('git symbolic-ref -q --short HEAD 2^>nul') do (
+        echo This is a developer copy on branch %%b. Update it with: git pull
+        goto :done
+    )
+)
+
+echo Checking for a new version...
+git fetch --quiet --force --tags origin
+if errorlevel 1 (
+    echo [!] Cannot reach %KOTA_REPO_URL%.
+    echo     Check the Internet connection and your Gitea login, then try again.
+    goto :fail
+)
+
+set "LATEST="
+for /f "delims=" %%t in ('git tag -l "v*" --sort^=-v:refname') do if not defined LATEST set "LATEST=%%t"
+if not defined LATEST (
+    echo [!] No released version found on the server.
+    goto :fail
+)
+set "CURRENT="
+for /f "delims=" %%t in ('git describe --tags --exact-match HEAD 2^>nul') do set "CURRENT=%%t"
+
+if "%CURRENT%"=="%LATEST%" (
+    echo You already have the newest version %LATEST%.
+    goto :deps
+)
+
+if defined CURRENT (
+    for /f "delims=" %%s in ('git status --porcelain --untracked-files^=no') do set "DIRTY=1"
+    if defined DIRTY (
+        echo Some tool files in this folder were changed by hand. They will be replaced by %LATEST%.
+        choice /m "Continue"
+        if errorlevel 2 goto :fail
+    )
+    echo Updating %CURRENT% -^> %LATEST%. Changes:
+    git --no-pager log --oneline --no-decorate "%CURRENT%..%LATEST%"
+) else (
+    echo Installing %LATEST%...
+)
+git -c advice.detachedHead=false checkout -q -f "%LATEST%"
+if errorlevel 1 goto :fail
+echo Now on %LATEST%.
+
+rem ---- Python libraries (only what changed) ----------------------------------
+:deps
+where uv >nul 2>nul
+if errorlevel 1 (
+    echo Installing uv ^(Python package runner, current user only^)...
+    powershell -NoProfile -ExecutionPolicy ByPass -c "irm https://astral.sh/uv/install.ps1 | iex"
+)
+where uv >nul 2>nul
+if errorlevel 1 (
+    echo [!] uv installation failed. Ask the firmware team for help.
+    goto :fail
+)
+echo Checking Python libraries...
+uv sync --frozen --no-dev --python 3.12 --quiet
+if errorlevel 1 goto :fail
+echo.
+echo Done. Start the tool with run_windows.bat.
+
+:done
+if not defined KOTA_NO_PAUSE pause
+exit /b 0
+
+:fail
+echo.
+echo [!] Update did not finish.
+if not defined KOTA_NO_PAUSE pause
+exit /b 1