feat(agents): align create name defaults

internal/service/agent_service.go

@@ -39,7 +39,7 @@ func (s *AgentService) DB() *gorm.DB {
 // Reference: Chatwoot agents_controller.rb#create → new_agent_params (email, name, role, availability, auto_offline)
 type CreateAgentRequest struct {
 	Email        string `json:"email" validate:"required,email"`
-	Name         string `json:"name" validate:"required,min=1"`
+	Name         string `json:"name" validate:"omitempty,min=1"`
 	Role         string `json:"role" validate:"omitempty,oneof=agent administrator"`
 	Availability string `json:"availability" validate:"omitempty,oneof=online offline busy"`
 	AutoOffline  bool   `json:"auto_offline"`
@@ -108,12 +108,16 @@ func (s *AgentService) Create(ctx context.Context, accountID uint, inviterID uin
 	if availability == "" {
 		availability = "offline"
 	}
+	name := strings.TrimSpace(req.Name)
+	if name == "" {
+		name = agentNameFromEmail(req.Email)
+	}
 
 	customRoleID := uint(0)
 	if req.CustomRoleID != nil {
 		customRoleID = *req.CustomRoleID
 	}
-	detail, err := s.agentRepo.CreateAgent(ctx, accountID, inviterID, req.Name, req.Email, role, availability, req.AutoOffline, customRoleID)
+	detail, err := s.agentRepo.CreateAgent(ctx, accountID, inviterID, name, req.Email, role, availability, req.AutoOffline, customRoleID)
 	if err != nil {
 		if errors.Is(err, repository.ErrAlreadyMember) {
 			return nil, repository.ErrAlreadyMember
@@ -171,6 +175,14 @@ func isValidBulkAgentEmail(email string) bool {
 	return err == nil && addr.Address == email
 }
 
+func agentNameFromEmail(email string) string {
+	email = strings.TrimSpace(email)
+	if at := strings.Index(email, "@"); at > 0 {
+		return email[:at]
+	}
+	return email
+}
+
 // AvailableAgentCount returns the number of additional agents that can be added to an account.
 // Reference: Chatwoot agents_controller.rb#available_agent_count — usage_limits[:agents] - agents.count
 // Returns -1 if no limit is set (0 = unlimited in our convention).