feat: one-click setup scripts for macOS, Linux, and Windows

scripts/setup.sh (bash) and scripts/setup.ps1 (PowerShell) wrap the
canonical Docker Compose flow: detect Docker + Compose v2 (with legacy
docker-compose fallback), copy .env.example to .env if missing, pull the
GHCR image, bring the stack up, poll /health until it's ready (90s cap),
print a summary, and open the URL in the default browser. Idempotent —
safe to re-run.

README quick-start now points designers at the one-liner as the primary
path, with the raw docker compose commands kept underneath for reference.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

scripts/setup.ps1

@@ -0,0 +1,89 @@
+# RefBoard one-click installer (Windows PowerShell).
+# Spins up the Docker Compose stack, waits for the backend to come up, and
+# opens the browser. Idempotent.
+#
+# Usage:
+#   pwsh -File scripts/setup.ps1
+#   # or in a PowerShell session at the repo root:
+#   .\scripts\setup.ps1
+
+[CmdletBinding()]
+param()
+
+$ErrorActionPreference = 'Stop'
+
+function Write-Info { param([string]$Msg) Write-Host "[setup] $Msg" -ForegroundColor Cyan }
+function Write-Ok   { param([string]$Msg) Write-Host "[setup] $Msg" -ForegroundColor Green }
+function Write-Fail { param([string]$Msg) Write-Host "[setup] $Msg" -ForegroundColor Red; exit 1 }
+
+# 1. Docker check
+if (-not (Get-Command docker -ErrorAction SilentlyContinue)) {
+  Write-Fail "Docker is not installed. Install Docker Desktop from https://www.docker.com/products/docker-desktop/"
+}
+
+$null = docker info 2>&1
+if ($LASTEXITCODE -ne 0) {
+  Write-Fail "Docker daemon is not running. Start Docker Desktop, then re-run this script."
+}
+
+# 2. Compose (v2 plugin preferred, legacy docker-compose fallback)
+$composeCmd = $null
+$null = docker compose version 2>&1
+if ($LASTEXITCODE -eq 0) {
+  $composeCmd = @('docker', 'compose')
+} elseif (Get-Command docker-compose -ErrorAction SilentlyContinue) {
+  $composeCmd = @('docker-compose')
+} else {
+  Write-Fail "Docker Compose is not installed. Re-install Docker Desktop (it bundles Compose v2)."
+}
+
+# 3. Working dir = repo root
+Set-Location (Split-Path -Parent $PSScriptRoot)
+
+# 4. .env
+if (-not (Test-Path .env)) {
+  if (-not (Test-Path .env.example)) {
+    Write-Fail "Neither .env nor .env.example found in $(Get-Location). Are you running this from the repo?"
+  }
+  Copy-Item .env.example .env
+  Write-Ok "Copied .env.example -> .env (defaults are fine for a local install)"
+} else {
+  Write-Info ".env already exists; leaving it untouched."
+}
+
+# 5. Pull + up
+$composeStr = ($composeCmd -join ' ')
+Write-Info "Pulling image (this may take a moment on first run)..."
+& $composeCmd[0] $composeCmd[1..($composeCmd.Length - 1)] pull
+
+Write-Info "Starting RefBoard..."
+& $composeCmd[0] $composeCmd[1..($composeCmd.Length - 1)] up -d --build
+
+# 6. Wait for /health
+$Url = "http://localhost:8000"
+Write-Info "Waiting for backend at $Url/health (max 90s)..."
+$up = $false
+for ($i = 1; $i -le 90; $i++) {
+  try {
+    $resp = Invoke-WebRequest -UseBasicParsing -Uri "$Url/health" -TimeoutSec 2
+    if ($resp.StatusCode -eq 200) { $up = $true; break }
+  } catch {}
+  Start-Sleep -Seconds 1
+}
+if (-not $up) {
+  Write-Fail "Backend didn't respond within 90s. Check logs with: $composeStr logs -f refboard"
+}
+Write-Ok "Backend is up."
+
+# 7. Summary + browser
+Write-Host ""
+Write-Host "  RefBoard is running." -ForegroundColor Green
+Write-Host ""
+Write-Host "    URL:           $Url"
+Write-Host "    Admin setup:   open the URL. The first account you create becomes admin."
+Write-Host "    Data dir:      .\.docker-data\  (SQLite + MinIO objects; back this up)"
+Write-Host "    Stop:          $composeStr down"
+Write-Host "    Logs:          $composeStr logs -f refboard"
+Write-Host ""
+
+Start-Process $Url