feat(server): handle account deleting properly (#12399)

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit

- **New Features**
  - Users are now prevented from deleting their account if they own one or more team workspaces. A clear error message instructs users to transfer ownership or delete those workspaces first.
  - Disabled (banned) users are explicitly prevented from signing in or re-registering.
  - Added new error messages and translations to improve clarity around account deletion restrictions.

- **Bug Fixes**
  - Disabled users are now explicitly handled to prevent sign-in attempts.

- **Tests**
  - Introduced comprehensive end-to-end tests covering account deletion, banning, and re-registration scenarios.

- **Chores**
  - Improved event handling for user deletion and subscription cancellation.
  - Updated localization resources with new error messages.
  - Renamed payment event handler class for clarity.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/server/src/core/auth/controller.ts

@@ -27,6 +27,7 @@ import {
   Throttle,
   URLHelper,
   UseNamedGuard,
+  WrongSignInCredentials,
 } from '../../base';
 import { Models, TokenType } from '../../models';
 import { validators } from '../utils/validators';
@@ -162,7 +163,10 @@ export class AuthController {
     clientNonce?: string
   ) {
     // send email magic link
-    const user = await this.models.user.getUserByEmail(email);
+    const user = await this.models.user.getUserByEmail(email, {
+      withDisabled: true,
+    });
+
     if (!user) {
       if (!this.config.auth.allowSignup) {
         throw new SignUpForbidden();
@@ -191,6 +195,8 @@ export class AuthController {
           throw new InvalidEmail({ email });
         }
       }
+    } else if (user.disabled) {
+      throw new WrongSignInCredentials({ email });
     }
 
     const ttlInSec = 30 * 60;

packages/backend/server/src/core/doc/event.ts

@@ -41,6 +41,7 @@ export class DocEventsListener {
   @OnEvent('user.deleted')
   async clearUserWorkspaces(payload: Events['user.deleted']) {
     for (const workspace of payload.ownedWorkspaces) {
+      await this.models.workspace.delete(workspace);
       await this.workspace.deleteSpace(workspace);
     }
   }