chore: replace docker compose setup with powershell backend launcher

start_backend.ps1

@@ -0,0 +1,35 @@
+Set-StrictMode -Version Latest
+$ErrorActionPreference = "Stop"
+
+$scriptDir = Split-Path -Parent $MyInvocation.MyCommand.Path
+Set-Location $scriptDir
+
+function Test-EnvVarLine {
+    param(
+        [Parameter(Mandatory = $true)][string]$FilePath,
+        [Parameter(Mandatory = $true)][string]$Name
+    )
+    if (-not (Test-Path -LiteralPath $FilePath)) {
+        return $false
+    }
+    return [bool](Select-String -Path $FilePath -Pattern ("^\s*" + [regex]::Escape($Name) + "=") -Quiet)
+}
+
+if (-not (Get-Command python -ErrorAction SilentlyContinue)) {
+    throw "Python was not found in PATH. Install Python 3.11+ and retry."
+}
+
+$envFile = Join-Path $scriptDir ".env"
+if (-not (Test-Path -LiteralPath $envFile)) {
+    Write-Warning ".env was not found at $envFile. Server startup may fail if required vars are missing."
+} else {
+    if (-not (Test-EnvVarLine -FilePath $envFile -Name "OPENAI_API_KEY")) {
+        Write-Warning ".env is missing OPENAI_API_KEY."
+    }
+    if (-not (Test-EnvVarLine -FilePath $envFile -Name "SCREENJOB_TOKEN")) {
+        Write-Warning ".env is missing SCREENJOB_TOKEN."
+    }
+}
+
+Write-Host "Starting ScreenJob backend on configured host/port..." -ForegroundColor Cyan
+python main.py server