feat(auth): add MINDA_DEMO support with auto-seeded demo accounts and username login

cmd/server/main.go

@@ -34,6 +34,15 @@ func main() {
 	// Seed SMTP defaults from environment variables into DB if not yet configured in DB
 	store.SeedSMTPDefaultsFromEnv(cfg.SMTPHost, cfg.SMTPPort, cfg.SMTPUser, cfg.SMTPPass, cfg.SMTPFrom, cfg.SMTPTLS)
 
+	if cfg.DemoMode {
+		log.Printf("🧪 Demo-Modus aktiv (MINDA_DEMO=true): Richte Demo-Benutzer admin/admin und user/user ein...")
+		if err := store.EnsureDemoAccounts(); err != nil {
+			log.Printf("⚠️ Fehler beim Anlegen der Demo-Accounts: %v", err)
+		} else {
+			log.Printf("✅ Demo-Accounts bereit: admin / admin (Admin-Rolle) und user / user (Standard-Rolle)")
+		}
+	}
+
 	wsHub := ws.NewHub()
 
 	staticFS, err := fs.Sub(embeddedDist, "dist")