Multi-akun clasp + gitignore clasp (dev/prod/bdn)

- Use-Clasp.ps1: swap profil login global per akun clasp
- scripts/clasp-env.ps1: wrapper satu pintu swap akun+project, guard PROD/BDN
- package.json: script use:dev/prod/bdn
- .gitignore: pola generik .clasp.*.json + package-lock.json (repo pakai yarn)

Use-Clasp.ps1

@@ -0,0 +1,48 @@
+#Requires -Version 5.1
+<#
+.SYNOPSIS
+  Aktifkan salah satu akun clasp (dev / prod / bdn) dengan swap file kredensial global.
+.DESCRIPTION
+  clasp hanya mengenal SATU login global (%USERPROFILE%\.clasprc.json) dan tidak
+  punya flag --local (terverifikasi di clasp 2.5.0). Skrip ini meng-copy profil
+  tersimpan (.clasp-accounts\<env>.clasprc.json) menjadi login aktif, lalu
+  verifikasi dengan `clasp login --status`.
+.EXAMPLE
+  powershell -NoProfile -ExecutionPolicy Bypass -File .\Use-Clasp.ps1 dev
+#>
+param(
+  [ValidateSet("dev", "prod", "bdn")]
+  [string]$Account = "dev"
+)
+
+$ErrorActionPreference = "Stop"
+
+$profileDir = Join-Path $env:USERPROFILE ".clasp-accounts"
+$src = Join-Path $profileDir ("$Account.clasprc.json")
+$dst = Join-Path $env:USERPROFILE ".clasprc.json"
+
+if (-not (Test-Path -LiteralPath $src)) {
+  Write-Output "Profil '$Account' belum ada: $src"
+  Write-Output "Cara buat (sekali per akun):"
+  Write-Output "  1. clasp login   # login sebagai akun-$Account di browser"
+  Write-Output "  2. New-Item -ItemType Directory -Force '$profileDir'"
+  Write-Output "  3. Copy-Item '$dst' '$src'"
+  exit 1
+}
+
+Copy-Item -LiteralPath $src -Destination $dst -Force
+Write-Output "Akun clasp aktif: $Account"
+
+$claspCmd = Get-Command clasp -ErrorAction SilentlyContinue
+if (-not $claspCmd) {
+  $localClasp = Join-Path $PSScriptRoot "node_modules/.bin/clasp.ps1"
+  if (Test-Path -LiteralPath $localClasp) { $claspCmd = $localClasp }
+  else { $claspCmd = "clasp" }
+}
+
+& $claspCmd login --status
+if ($LASTEXITCODE -ne 0) {
+  Write-Output "Token profil '$Account' tidak valid/kadaluarsa."
+  Write-Output "Perbaiki: clasp login (sebagai akun-$Account), lalu Copy-Item '$dst' '$src' -Force"
+  exit 1
+}