feat: add hytale-presskit module for Creator Presskit tracking

Adds new module to track CreatorPressKit.zip file size changes via HEAD requests.
Alerts with old/new size and diff. Also updates sign-token.ts with correct account ID.

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

scripts/sign-token.ts

@@ -24,7 +24,7 @@ const jwtSecret = process.env.JWT_SECRET || 'your-secret-key'
 
 const payload = {
   scope: scopes,
-  sub: 'test-client',
+  sub: 'starkow',
   iat: Math.floor(Date.now() / 1000),
   exp: Math.floor(Date.now() / 1000) + (expirationHours * 3600),
 }