Send invite emails as HTML with clickable button, redirect login to wiki

Invite emails now include both plain text and HTML versions. The
{loginLink} placeholder renders as a styled button in HTML email
clients. Other URLs in the template are auto-linked. The auth verify
endpoint redirects to wiki.ghostguild.org instead of /members.

server/api/auth/verify.get.js

@@ -52,8 +52,8 @@ export default defineEventHandler(async (event) => {
       maxAge: 60 * 60 * 24 * 7 // 7 days
     })
     
-    // Redirect to the members dashboard or home page
-    await sendRedirect(event, '/members', 302)
+    // Redirect to the wiki
+    await sendRedirect(event, 'https://wiki.ghostguild.org', 302)
     
   } catch (err) {
     if (err.statusCode && err.statusCode !== 401) {