feat: implement repository layer for data access

- Add CertificateRepository with CRUD operations
- Implement CertificateAuthorityRepository for CA management
- Add CertificateRequestRepository for CSR handling
- Include UserRepository and OrganizationRepository
- Implement proper error handling and validation
- Add support for soft deletes and relationships
- Include query optimization and filtering capabilities

repositories/ca.go

@@ -0,0 +1,56 @@
+package repositories
+
+import (
+	"git.secnex.io/secnex/certman/models"
+	"gorm.io/gorm"
+)
+
+type CertificateAuthorityRepository struct {
+	db *gorm.DB
+}
+
+// NewCertificateAuthorityRepository creates a new certificate authority repository
+func NewCertificateAuthorityRepository(db *gorm.DB) *CertificateAuthorityRepository {
+	return &CertificateAuthorityRepository{db: db}
+}
+
+// GetByID returns a certificate authority by their ID
+func (r *CertificateAuthorityRepository) GetByID(id string) (models.CertificateAuthority, error) {
+	var ca models.CertificateAuthority
+	if err := r.db.Where("id = ?", id).First(&ca).Error; err != nil {
+		return models.CertificateAuthority{}, err
+	}
+	return ca, nil
+}
+
+// GetAll returns all certificate authorities
+func (r *CertificateAuthorityRepository) GetAll() ([]models.CertificateAuthority, error) {
+	var cas []models.CertificateAuthority
+	if err := r.db.Find(&cas).Error; err != nil {
+		return []models.CertificateAuthority{}, err
+	}
+	return cas, nil
+}
+
+// Create creates a new certificate authority
+func (r *CertificateAuthorityRepository) Create(ca models.CertificateAuthority) (models.CertificateAuthority, error) {
+	if err := r.db.Create(&ca).Error; err != nil {
+		return models.CertificateAuthority{}, err
+	}
+	return ca, nil
+}
+
+// Update updates a certificate authority
+func (r *CertificateAuthorityRepository) Update(ca models.CertificateAuthority) error {
+	return r.db.Save(&ca).Error
+}
+
+// Delete deletes a certificate authority by their ID
+func (r *CertificateAuthorityRepository) Delete(id string) error {
+	return r.db.Delete(&models.CertificateAuthority{}, id).Error
+}
+
+// HardDelete deletes a certificate authority by their ID
+func (r *CertificateAuthorityRepository) HardDelete(ca models.CertificateAuthority) error {
+	return r.db.Unscoped().Delete(&ca).Error
+}