Fix production environment variables

- Remove old Confluence variables
- Add NEXT_PUBLIC_API_URL for API access

🤖 Generated with [Claude Code](https://claude.ai/code)

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

terraform/terraform.tfvars.example

@@ -7,5 +7,10 @@ confluence_api_url = "https://your-domain.atlassian.net"
 confluence_token   = "your_confluence_api_token"
 confluence_page_id = "your_confluence_page_id"
 
+# Admin Authentication
+jwt_secret          = "your-secret-key-at-least-32-characters-long"
+admin_username      = "admin"
+admin_password_hash = "bcrypt-hash-generated-by-generate-password-hash.js"
+
 # Optional: Custom domain
 # domain_name = "filamenteka.yourdomain.com"