build(windows): scripts build one-click + installer + doc

- build_windows_oneclick.bat / build_windows_installer_oneclick.bat : wrappers
- scripts/build_windows_oneclick.ps1 / build_windows_installer_only.ps1 / install_inno_setup_build_dep.ps1
- build_signing.example.ps1 : exemple protocole signing (sans secret)
- docs/build-windows-oneclick.md : documentation du build

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

build_windows_installer_oneclick.bat

@@ -0,0 +1,28 @@
+@echo off
+setlocal
+
+set "SCRIPT_DIR=%~dp0"
+set "PS_SCRIPT=%SCRIPT_DIR%scripts\build_windows_oneclick.ps1"
+
+if not exist "%PS_SCRIPT%" (
+  echo Script PowerShell introuvable : %PS_SCRIPT%
+  pause
+  exit /b 1
+)
+
+echo Lancement du build Windows avec installateur...
+powershell -NoLogo -NoProfile -ExecutionPolicy Bypass -File "%PS_SCRIPT%"
+set "EXITCODE=%ERRORLEVEL%"
+
+if not "%EXITCODE%"=="0" (
+  echo.
+  echo Le build installateur a echoue. Code retour : %EXITCODE%
+  pause
+  exit /b %EXITCODE%
+)
+
+echo.
+echo Build installateur termine avec succes.
+echo Sortie attendue : release\Anonymisation-Setup.exe
+pause
+exit /b 0