fix: disable SSL for local PostgreSQL connection

The votc-db container doesn't support SSL connections, causing
"The server does not support SSL connections" errors on the
waitlist signup endpoint in production.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

api/waitlist-db.js

@@ -7,7 +7,7 @@ const nodemailer = require('nodemailer');
 // Initialize PostgreSQL connection pool
 const pool = new Pool({
   connectionString: process.env.DATABASE_URL,
-  ssl: process.env.NODE_ENV === 'production' ? { rejectUnauthorized: false } : false
+  ssl: false
 });
 
 // Initialize SMTP transport (Mailcow)