Delete user account by OpenID with tenant validation

DELETE https://tenants-gateway-api-sbx.sidedrawersbx.com/api/v1/tenants/tenant/tenant-id/{tenantId}/users/open-id/{openId}

Permanently deletes a user account and all associated data across the Sidedrawer platform.
This operation is irreversible and will remove all user data including documents, records, 
comments, reminders, and other associated resources.

**Tenant Validation:**
- Account must belong to the specified tenant
- Validation follows ENFORCE_TENANT_ACCOUNT_OWNERSHIP environment variable

**Deletion Process:**
1. Validates tenant ownership of the account
2. Performs soft or hard deletion based on configuration
3. Removes or anonymizes data across all dependent services
4. Maintains audit trail for compliance

**Affected Services:**
- user-api: Account deletion and authentication cleanup
- records-api: Document ownership transfer or deletion
- record-files-api: File ownership cleanup
- networks-api: Sharing and collaboration cleanup
- comments-api: Comment ownership anonymization or deletion
- reminders-api: User reminder cleanup

**Note:** This operation cannot be undone. Ensure proper authorization before execution.
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