Baseline: WPF/Avalonia/Cli/Core + plans (BROWSER_FEATURES_PLAN v2, MOBILE_PLAN v1)

build/installer.iss

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+; VideoDownloader Windows 설치자 (Inno Setup)
+; publish.ps1 이 /DARCH=x64 또는 /DARCH=arm64 로 2회 컴파일 → out/VideoDownloader-Setup-<arch>.exe
+
+#define APP_NAME      "VideoDownloader"
+#define APP_PUBLISHER "VideoDownloader"
+#define APP_EXE       "VideoDownloader.exe"
+#ifndef APP_VERSION
+  #define APP_VERSION "1.0.0"
+#endif
+#ifndef ARCH
+  #error ARCH must be defined (x64 or arm64) via /DARCH=
+#endif
+
+[Setup]
+AppName={#APP_NAME}
+AppVersion={#APP_VERSION}
+AppPublisher={#APP_PUBLISHER}
+UninstallDisplayIcon={app}\{#APP_EXE}
+DefaultDirName={autopf}\{#APP_NAME}
+DefaultGroupName={#APP_NAME}
+DisableProgramGroupPage=yes
+; per-user 설치 → {autopf} = %LocalAppData%\Programs, UAC 없음
+PrivilegesRequired=lowest
+PrivilegesRequiredOverridesAllowed=dialog
+OutputDir=..\out
+WizardStyle=modern
+Compression=lzma2
+SolidCompression=yes
+ArchitecturesInstallIn64BitMode=x64compatible
+
+#if ARCH == "arm64"
+  ; arm64 전용(네이티브). x64 머신에선 거부.
+  ArchitecturesAllowed=arm64
+  AppId={{2E0ADFC1-2072-4457-8C50-ECFCEDECAD73}
+  OutputBaseFilename=VideoDownloader-Setup-arm64
+#else
+  ; x64 + arm64(x64 에뮬레이션 폴백) 어디서든 설치 가능한 범용 설치자.
+  ArchitecturesAllowed=x64compatible
+  AppId={{65393C7D-17DC-4B9F-9D0B-F9911092C449}
+  OutputBaseFilename=VideoDownloader-Setup-x64
+#endif
+
+[Languages]
+Name: "korean"; MessagesFile: "compiler:Languages\Korean.isl"
+Name: "english"; MessagesFile: "compiler:Default.isl"
+
+[Tasks]
+Name: "desktopicon"; Description: "{cm:CreateDesktopIcon}"; GroupDescription: "{cm:AdditionalIcons}"; Flags: unchecked
+
+[Files]
+; self-contained publish 결과 전체를 앱 디렉터리로 복사
+Source: "{#PUBLISH_DIR}\*"; DestDir: "{app}"; Flags: recursesubdirs createallsubdirs ignoreversion
+
+[Icons]
+Name: "{group}\{#APP_NAME}"; Filename: "{app}\{#APP_EXE}"
+Name: "{group}\{#APP_NAME} 제거"; Filename: "{uninstallexe}"
+Name: "{commondesktop}\{#APP_NAME}"; Filename: "{app}\{#APP_EXE}"; Tasks: desktopicon
+
+[Run]
+Filename: "{app}\{#APP_EXE}"; Description: "{cm:LaunchProgram,{#APP_NAME}}"; Flags: nowait postinstall skipifsilent

build/publish.ps1

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+# VideoDownloader 다중 아키텍처 설치자 빌드
+# 사용: ./build/publish.ps1 [-Config Release] [-Version 1.0.0]
+# 결과: out/VideoDownloader-Setup-x64.exe, out/VideoDownloader-Setup-arm64.exe
+param(
+    [string]$Config = "Release",
+    [string]$Version = "1.0.0",
+    [string[]]$Archs = @("x64", "arm64")
+)
+
+$ErrorActionPreference = "Stop"
+$root   = Split-Path -Parent $PSScriptRoot            # 레포 루트
+$app    = Join-Path $root "VideoDownloader.App\VideoDownloader.App.csproj"
+$iss    = Join-Path $PSScriptRoot "installer.iss"
+$outDir = Join-Path $root "out"
+
+# --- ISCC(=Inno Setup 컴파일러) 위치 해결 ---
+$iscc = $null
+foreach ($cand in @(
+    "${env:ProgramFiles(x86)}\Inno Setup 6\ISCC.exe",
+    "$env:ProgramFiles\Inno Setup 6\ISCC.exe",
+    "$env:LOCALAPPDATA\Programs\Inno Setup 6\ISCC.exe",
+    "$env:LOCALAPPDATA\Programs\Inno Setup 6.7\ISCC.exe"
+)) {
+    if ($cand -and (Test-Path $cand)) { $iscc = $cand; break }
+}
+if (-not $iscc) { $iscc = (Get-Command ISCC.exe -ErrorAction SilentlyContinue).Source }
+if (-not $iscc) {
+    throw "Inno Setup(ISCC) 를 찾을 수 없습니다. 설치: winget install --id JRSoftware.InnoSetup -e"
+}
+Write-Host "ISCC: $iscc" -ForegroundColor DarkGray
+New-Item -ItemType Directory -Force -Path $outDir | Out-Null
+
+foreach ($arch in $Archs) {
+    $rid  = "win-$arch"
+    $pub  = Join-Path $root "publish\$arch"
+    Write-Host ""
+    Write-Host "==== [$arch] publish ($rid, self-contained) ====" -ForegroundColor Cyan
+    if (Test-Path $pub) { Remove-Item $pub -Recurse -Force }
+    # WPF 멀티플랫폼: Platform 축을 RID 와 일치시켜 빌드.
+    dotnet publish $app -c $Config -r $rid -p:Platform=$arch --self-contained -o $pub
+    if ($LASTEXITCODE -ne 0) { throw "publish 실패: $rid (exit $LASTEXITCODE). arm64 는 yt-dlp/WebView2 런타임 관련 처음 빌드 시 이슈가 있을 수 있습니다." }
+
+    Write-Host "==== [$arch] Inno Setup 컴파일 ====" -ForegroundColor Cyan
+    & $iscc /Q "/DAPP_VERSION=$Version" "/DARCH=$arch" "/DPUBLISH_DIR=$pub" $iss
+    if ($LASTEXITCODE -ne 0) { throw "ISCC 실패: $arch (exit $LASTEXITCODE)" }
+    Write-Host "완료: out\VideoDownloader-Setup-$arch.exe" -ForegroundColor Green
+}
+
+Write-Host ""
+Write-Host "설치자 생성 완료:" -ForegroundColor Green
+Get-ChildItem (Join-Path $outDir "VideoDownloader-Setup-*.exe") |
+    ForEach-Object { Write-Host ("  {0,-38} {1:N1} MB" -f $_.Name, ($_.Length / 1MB)) }