chore: add root startup scripts

dev.ps1

@@ -0,0 +1,42 @@
+param(
+  [switch]$FrontendOnly,
+  [switch]$BackendOnly,
+  [string]$DatabaseUrl = "postgres://postgres:postgres%402025%21@10.0.0.2:5432/termi-api_development"
+)
+
+$ErrorActionPreference = "Stop"
+
+$repoRoot = Split-Path -Parent $MyInvocation.MyCommand.Path
+$frontendScript = Join-Path $repoRoot "start-frontend.ps1"
+$backendScript = Join-Path $repoRoot "start-backend.ps1"
+
+if ($FrontendOnly -and $BackendOnly) {
+  throw "Use either -FrontendOnly or -BackendOnly, not both."
+}
+
+if ($FrontendOnly) {
+  & $frontendScript
+  exit $LASTEXITCODE
+}
+
+if ($BackendOnly) {
+  & $backendScript -DatabaseUrl $DatabaseUrl
+  exit $LASTEXITCODE
+}
+
+Write-Host "[monorepo] Starting frontend and backend in separate PowerShell windows..." -ForegroundColor Cyan
+
+Start-Process powershell -ArgumentList @(
+  "-NoExit",
+  "-ExecutionPolicy", "Bypass",
+  "-File", $frontendScript
+)
+
+Start-Process powershell -ArgumentList @(
+  "-NoExit",
+  "-ExecutionPolicy", "Bypass",
+  "-File", $backendScript,
+  "-DatabaseUrl", $DatabaseUrl
+)
+
+Write-Host "[monorepo] Frontend window and backend window started." -ForegroundColor Green