feat: add LDAP support and guest user functionality

- Introduced BaseDN configuration for LDAP in the config.
- Enhanced User model to include IsLDAP field.
- Updated database queries to handle LDAP users.
- Implemented GraphQL queries for LDAP browsing and user authentication type.
- Added ACL management for users and groups, including guest user permissions.
- Updated frontend to support LDAP login and guest user login.
- Improved error handling and user feedback in login and ACL management.

backend/internal/config/config.go

@@ -17,6 +17,7 @@ type Config struct {
 
 type LDAPConfig struct {
 	Url       string `json:"url"`
+	BaseDN    string `json:"base_dn"`
 	AdminUser string `json:"admin_user"`
 	AdminPass string `json:"admin_pass"`
 }