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/organization.go

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