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/crl.go

@@ -0,0 +1,37 @@
+package models
+
+import (
+	"time"
+
+	"github.com/google/uuid"
+	"gorm.io/gorm"
+)
+
+// CertificateRevocationList represents a Certificate Revocation List (CRL)
+type CertificateRevocationList struct {
+	ID                     uuid.UUID      `json:"id" gorm:"type:uuid;primary_key;default:gen_random_uuid()"`
+	SerialNumber           string         `json:"serial_number" gorm:"not null;unique"`
+	CertificateAuthorityID uuid.UUID      `json:"certificate_authority_id" gorm:"type:uuid;not null"`
+	Version                int            `json:"version" gorm:"not null;default:2"`
+	ThisUpdate             time.Time      `json:"this_update" gorm:"not null"`
+	NextUpdate             time.Time      `json:"next_update" gorm:"not null"`
+	FilePath               string         `json:"file_path" gorm:"not null"` // Path to CRL file
+	RevokedCertificates    string         `json:"revoked_certificates"`      // JSON array of revoked certificate serial numbers with reasons
+	CreatedAt              time.Time      `json:"created_at" gorm:"autoCreateTime"`
+	UpdatedAt              time.Time      `json:"updated_at" gorm:"autoUpdateTime"`
+	DeletedAt              gorm.DeletedAt `json:"deleted_at" gorm:"index"`
+
+	// Relationships
+	CertificateAuthority *CertificateAuthority `json:"certificate_authority" gorm:"foreignKey:CertificateAuthorityID"`
+}
+
+// TableName returns the table name for CertificateRevocationList
+func (crl *CertificateRevocationList) TableName() string {
+	return "certificate_revocation_lists"
+}
+
+// BeforeCreate generates a new UUID before creating the record
+func (crl *CertificateRevocationList) BeforeCreate(tx *gorm.DB) (err error) {
+	crl.ID = uuid.New()
+	return
+}