테넌트 등록 방식을 결정

backend/internal/domain/auth_models.go

@@ -70,9 +70,10 @@ type UserProfileResponse struct {
 	Email           string `json:"email"`
 	Name            string `json:"name"`
 	Phone           string `json:"phone"`
-	Department      string `json:"department"`
-	AffiliationType string `json:"affiliationType"`
-	CompanyCode     string `json:"companyCode,omitempty"`
+	Department      string  `json:"department"`
+	AffiliationType string  `json:"affiliationType"`
+	CompanyCode     string  `json:"companyCode,omitempty"`
+	Tenant          *Tenant `json:"tenant,omitempty"`
 }
 
 type UpdateUserRequest struct {

backend/internal/domain/tenant.go

@@ -14,6 +14,7 @@ type Tenant struct {
 	Slug        string         `gorm:"uniqueIndex;not null" json:"slug"`
 	Description string         `json:"description"`
 	Status      string         `gorm:"default:'active'" json:"status"`
+	Domains     []TenantDomain `gorm:"foreignKey:TenantID" json:"domains,omitempty"`
 	CreatedAt   time.Time      `json:"createdAt"`
 	UpdatedAt   time.Time      `json:"updatedAt"`
 	DeletedAt   gorm.DeletedAt `gorm:"index" json:"-"`

backend/internal/domain/tenant_domain.go

@@ -0,0 +1,27 @@
+package domain
+
+import (
+	"time"
+
+	"github.com/google/uuid"
+	"gorm.io/gorm"
+)
+
+// TenantDomain represents a domain associated with a tenant for auto-assignment.
+type TenantDomain struct {
+	ID        string         `gorm:"primaryKey;type:uuid;default:gen_random_uuid()" json:"id"`
+	TenantID  string         `gorm:"type:uuid;not null;index" json:"tenantId"`
+	Domain    string         `gorm:"uniqueIndex;not null" json:"domain"` // e.g. "example.com"
+	Verified  bool           `gorm:"default:false" json:"verified"`
+	CreatedAt time.Time      `json:"createdAt"`
+	UpdatedAt time.Time      `json:"updatedAt"`
+	DeletedAt gorm.DeletedAt `gorm:"index" json:"-"`
+}
+
+// BeforeCreate hook to generate UUID if not present.
+func (td *TenantDomain) BeforeCreate(tx *gorm.DB) (err error) {
+	if td.ID == "" {
+		td.ID = uuid.NewString()
+	}
+	return
+}

backend/internal/domain/user.go

@@ -17,6 +17,8 @@ type User struct {
 	Role            string         `gorm:"default:'user'" json:"role"` // 'admin', 'user'
 	AffiliationType string         `json:"affiliationType"`
 	CompanyCode     string         `json:"companyCode"`
+	TenantID        *string        `gorm:"type:uuid;index" json:"tenantId,omitempty"`
+	Tenant          *Tenant        `gorm:"foreignKey:TenantID" json:"tenant,omitempty"`
 	Department      string         `json:"department"`
 	Status          string         `gorm:"default:'active'" json:"status"`
 	CreatedAt       time.Time      `json:"createdAt"`