Fix the issue of slow startup when using wails3 dev

build/wait.ps1

@@ -0,0 +1,28 @@
+# Wait for a specified number of seconds and check the frontend server
+param(
+    [int]$Seconds = 5,
+    [string]$Url = "http://localhost:9245"
+)
+
+Write-Host "Waiting for frontend to start..." -ForegroundColor Yellow
+
+$elapsed = 0
+$interval = 1
+
+while ($elapsed -lt $Seconds) {
+    try {
+        $response = Invoke-WebRequest -Uri $Url -Method Head -TimeoutSec 1 -ErrorAction SilentlyContinue
+        if ($response.StatusCode -eq 200) {
+            Write-Host "✓ Frontend server is ready ($elapsed seconds)" -ForegroundColor Green
+            exit 0
+        }
+    } catch {
+        # Continue waiting
+    }
+    
+    Start-Sleep -Seconds $interval
+    $elapsed += $interval
+    Write-Host "  Waiting... ($elapsed/$Seconds seconds)" -ForegroundColor Gray
+}
+
+Write-Host "✓ Waiting finished (up to $Seconds seconds)" -ForegroundColor Green