fix: gateway script issue

scripts/start_gateway.ps1

@@ -17,7 +17,33 @@ if ($Port -le 0) {
 Write-Host "Starting FastAPI Gateway local dev server on port $Port..." -ForegroundColor Cyan
 Push-Location $gatewayDir
 try {
+    # Check if virtual environment exists, if not, bootstrap it
+    if (-not (Test-Path ".venv")) {
+        Write-Host "Python virtual environment not found. Bootstrapping gateway environment..." -ForegroundColor Yellow
+        
+        # Verify Python is installed
+        if (-not (Get-Command python -ErrorAction SilentlyContinue)) {
+            Write-Error "Python was not found on your PATH. Please install Python 3.11+ and try again."
+            return
+        }
+        
+        Write-Host "Creating virtual environment in $gatewayDir\.venv..." -ForegroundColor Yellow
+        & python -m venv .venv
+        if ($LASTEXITCODE -ne 0 -or -not (Test-Path ".venv")) {
+            Write-Error "Failed to create Python virtual environment."
+            return
+        }
+        
+        Write-Host "Installing gateway dependencies (pip install -e '.[dev]')..." -ForegroundColor Yellow
+        & .venv\Scripts\pip install -e ".[dev]"
+        if ($LASTEXITCODE -ne 0) {
+            Write-Error "Failed to install gateway dependencies."
+            return
+        }
+        Write-Host "Bootstrap complete!" -ForegroundColor Green
+    }
+
     & .venv\Scripts\uvicorn app.main:app --reload --port $Port
 } finally {
     Pop-Location
-}
+}