feat(dns): Implement DNS record management and query handling

- Added models for various DNS record types: A, AAAA, CNAME, MX, SRV, and TXT.
- Created repository functions for CRUD operations on DNS records.
- Developed DNS server functionality to handle incoming queries and forward them to upstream servers.
- Implemented local resolution for DNS queries, including support for A, AAAA, CNAME, MX, TXT, and SRV records.
- Enhanced SMTP server to support TLS and STARTTLS configurations.
- Improved email session handling with local delivery and error logging.
- Added new log messages for better traceability of DNS operations and SMTP actions.

1 files changed, 13 insertions, 0 deletions

diff --git a/models/dns/cname.go b/models/dns/cname.go
new file mode 100644
index 0000000..5460f82
--- /dev/null
+++ b/models/dns/cname.go
@@ -0,0 +1,13 @@
+package dns
+
+import (
+	"gorm.io/gorm"
+)
+
+type CNAMERecord struct {
+	gorm.Model
+	DomainID uint   `gorm:"not null;index" json:"domain_id"`
+	Name     string `gorm:"not null" json:"name"`
+	Target   string `gorm:"not null" json:"target"`
+	TTL      uint32 `gorm:"not null;default:300" json:"ttl"`
+}