try to fix runtime error and add runtime logs

src/app/api/contact/route.ts

@@ -44,6 +44,8 @@ export async function POST(req: NextRequest) {
 
   const cf_token = data["cf-turnstile-response"];
 
+  console.log(`[${agent}] Verify captcha`);
+
   if (typeof cf_token !== 'string' || !cf_token.trim()) {
     return NextResponse.json(
       { error: "Captcha Failed" },
@@ -59,6 +61,8 @@ export async function POST(req: NextRequest) {
       { status: 403 }
     );
   }
+  
+  console.log(`[${agent}] Verify rate limit`);
 
   const isRateLimited = await rateLimited(agent);
   
@@ -76,12 +80,16 @@ export async function POST(req: NextRequest) {
     );
   }
 
+  console.log(`[${agent}] Sending email...`);
+
   try {
     const email = data.anon || !data.email ? process.env.SMTP_USER : data.email;
     const name = trimTooLong(data.anon || !data.name ? 'Anonymous' : data.name, 20);
 
     await sendEmail(name, email, data.message);
 
+    console.log(`[${agent}] Email sended...`);
+
     return NextResponse.json({ status: "ok" });
   }
   catch (err) {