fix: roles query failing due to composite primary key in GORM many2many

Add explicit foreignKey/references tags to Role.Permissions association
so GORM uses only ID (not composite ID+TenantID) for the join table.

internal/modules/rbac/domain/role.go

@@ -11,7 +11,7 @@ type Role struct {
 	CreatedAt   time.Time `json:"created_at"`
 	UpdatedAt   time.Time `json:"updated_at"`
 
-	Permissions []Permission `json:"permissions,omitempty" gorm:"many2many:role_permissions;"`
+	Permissions []Permission `json:"permissions,omitempty" gorm:"many2many:role_permissions;foreignKey:ID;references:ID;joinForeignKey:RoleID;joinReferences:PermissionID"`
 }
 
 func (Role) TableName() string {