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>

scripts/install_inno_setup_build_dep.ps1

@@ -0,0 +1,57 @@
+param(
+    [string]$DownloadUrl = "https://jrsoftware.org/download.php/is.exe"
+)
+
+$ErrorActionPreference = "Stop"
+
+function Write-Step {
+    param([string]$Message)
+    Write-Host ""
+    Write-Host "=== $Message ===" -ForegroundColor Cyan
+}
+
+function Find-InnoCompiler {
+    $candidates = @()
+    if (${env:ProgramFiles(x86)}) {
+        $candidates += (Join-Path ${env:ProgramFiles(x86)} "Inno Setup 6\ISCC.exe")
+    }
+    if ($env:ProgramFiles) {
+        $candidates += (Join-Path $env:ProgramFiles "Inno Setup 6\ISCC.exe")
+    }
+    if ($env:LOCALAPPDATA) {
+        $candidates += (Join-Path $env:LOCALAPPDATA "Programs\Inno Setup 6\ISCC.exe")
+        $candidates += (Join-Path $env:LOCALAPPDATA "Inno Setup 6\ISCC.exe")
+    }
+    foreach ($candidate in $candidates) {
+        if ($candidate -and (Test-Path $candidate)) {
+            return $candidate
+        }
+    }
+    return $null
+}
+
+$existing = Find-InnoCompiler
+if ($existing) {
+    Write-Host "Inno Setup deja disponible : $existing"
+    exit 0
+}
+
+Write-Step "Telechargement Inno Setup"
+$installerPath = Join-Path $env:TEMP "innosetup-build-dep.exe"
+Invoke-WebRequest -Uri $DownloadUrl -OutFile $installerPath
+Write-Host "Installeur telecharge : $installerPath"
+
+Write-Step "Installation Inno Setup utilisateur"
+$args = @("/SP-", "/VERYSILENT", "/SUPPRESSMSGBOXES", "/NORESTART", "/CURRENTUSER")
+$process = Start-Process -FilePath $installerPath -ArgumentList $args -Wait -PassThru
+Write-Host "Code retour : $($process.ExitCode)"
+if ($process.ExitCode -ne 0) {
+    throw "Installation Inno Setup echouee avec le code $($process.ExitCode)."
+}
+
+$compiler = Find-InnoCompiler
+if (-not $compiler) {
+    throw "ISCC.exe introuvable apres installation Inno Setup."
+}
+
+Write-Host "Inno Setup pret : $compiler"