Add verification code storage for Discord usernames

Updates the `/verify` command in discord-bot/commands/verify.js to include the Discord username when storing verification codes in the `discord_verifications` table.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 9203795e-937a-4306-b81d-b4d5c78c240e
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Event-Id: 8bd9c239-20ba-45f9-afec-76bd4f2adfd0
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/7c94b7a0-29c7-4f2e-94ef-44b2153872b7/9203795e-937a-4306-b81d-b4d5c78c240e/saoW2ee
Replit-Helium-Checkpoint-Created: true

.replit

@@ -1,4 +1,4 @@
-modules = ["nodejs-20", "web"]
+modules = ["nodejs-20", "web", "postgresql-16"]
 [agent]
 expertMode = true
 

discord-bot/commands/verify.js

@@ -40,10 +40,11 @@ module.exports = {
         .toUpperCase();
       const expiresAt = new Date(Date.now() + 15 * 60 * 1000); // 15 minutes
 
-      // Store verification code
+      // Store verification code with Discord username
       await supabase.from("discord_verifications").insert({
         discord_id: interaction.user.id,
         verification_code: verificationCode,
+        username: interaction.user.username,
         expires_at: expiresAt.toISOString(),
       });