Fix reset-password email sending undefined as email field; v2.0.11

Was passing data.hosts[idx].username (doesn't exist on stored hosts)
instead of data.hosts[idx].email for the welcome/reset email username param.

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

server/routes/nuggets-host-upload.js

@@ -349,7 +349,7 @@ export function register(app) {
       sendNuggetsHostWelcomeEmail({
         to: data.hosts[idx].email,
         name: data.hosts[idx].name,
-        username: data.hosts[idx].username,
+        username: data.hosts[idx].email,
         password: newPassword,
         portalUrl: `${process.env.SITE_URL ?? 'https://versebyversewithnate.us'}/host`,
       }).catch(err => console.error('[nuggets-host] reset email error:', err))