feat: add comprehensive database models and type definitions

- Define Certificate model with full X.509 attributes
- Add CertificateAuthority model for CA management
- Implement CertificateRequest model for CSR handling
- Add CertificateRevocationList model for CRL support
- Define User and Organization models for access control
- Include comprehensive certificate type definitions (web, client, email, etc.)
- Add status enums for certificates, requests, and organizations
- Configure GORM relationships and constraints

models/user.go

@@ -0,0 +1,39 @@
+package models
+
+import (
+	"time"
+
+	"git.secnex.io/secnex/certman/utils"
+	"github.com/google/uuid"
+	"gorm.io/gorm"
+)
+
+type User struct {
+	ID         uuid.UUID      `json:"id" gorm:"type:uuid;primary_key;default:gen_random_uuid()"`
+	Username   string         `json:"username" gorm:"not null;unique"`
+	Email      string         `json:"email" gorm:"not null;unique"`
+	Password   string         `json:"password" gorm:"not null"`
+	ExternalID *string        `json:"external_id" gorm:"unique"`
+	CreatedAt  time.Time      `json:"created_at" gorm:"autoCreateTime"`
+	UpdatedAt  time.Time      `json:"updated_at" gorm:"autoUpdateTime"`
+	DeletedAt  gorm.DeletedAt `json:"deleted_at" gorm:"index"`
+
+	OrganizationsCreated []*Organization `json:"organizations_created" gorm:"foreignKey:CreatedBy"`
+	OrganizationsUpdated []*Organization `json:"organizations_updated" gorm:"foreignKey:UpdatedBy"`
+
+	// Members of organizations
+	Organizations []*Organization `json:"organizations" gorm:"many2many:organization_members;"`
+}
+
+func (u *User) TableName() string {
+	return "users"
+}
+
+func (u *User) BeforeCreate(tx *gorm.DB) (err error) {
+	u.ID = uuid.New()
+	u.Password, err = utils.HashPassword(u.Password, utils.DefaultParams)
+	if err != nil {
+		return err
+	}
+	return
+}