[Hardening] F-09: No Email Alerts for Security-Relevant Events.

### The required feature described as a wish

**Description:** CloudStack does not send email notifications to users or administrators when security-relevant events occur on their accounts. Specifically, no alerts are generated for password changes, creation of API keys, failed login attempts, or exposure of data containing secrets, such as `kubeconfig`.

**Affected Components:** Management

**Impact:** Since users have no out-of-band visibility into actions taken on their accounts, an attacker may go undetected indefinitely, establish persistence by creating API keys, try to guess users' passwords, attempt to access users' accounts from an unauthorized source (see F-12), or silently lock the user out by resetting their password. This significantly increases the window of exposure following a credential compromise.

**Steps to Reproduce:**
- Log in to the CloudStack Management UI as any user.
- Change your own password.
- Generate API keys.
- Reveal Kubernetes configuration.
- Attempt to log in with an incorrect password.
- Attempt to log in from an unauthorized source.
- Check for an email notification confirming that any of the above actions occurred.

**Recommended Remediation:** Implement email notifications for security-sensitive account events, including but not limited to the ones listed above. Each notification should include the timestamp, source IP address, and nature of the action performed. All triggering events should additionally be recorded as audit log entries to support forensic investigation and compliance reporting.

Non vengono indicati file sorgente né test. Inizia dai flussi della Management UI per la modifica delle password, la creazione di API-key, gli accessi non riusciti o non autorizzati e l’esposizione della configurazione di Kubernetes, quindi segui la relativa gestione degli audit-log e i percorsi di notifica. Il lavoro è completato quando ogni evento di sicurezza elencato registra i dati di audit richiesti e invia un’e-mail contenente il relativo timestamp, source IP e azione.

Scritto dal modello di indicizzazione a partire dal testo della issue.