feat: Enhance mail and domain management UI and functionality

- Updated users page to include a help link with an icon.
- Refactored sidebar navigation to improve organization and added collapsible sections for Domains and Mail.
- Created new pages for managing domains and TLDs, including a detailed description of the Domain Manager.
- Implemented confirmation modals for deleting TLDs with appropriate messaging.
- Added JavaScript functionality for sidebar state management and confirmation modals.
- Introduced new Go handlers for mail index and domain management.
- Added validation functions for DNS labels and email local parts.

1 files changed, 11 insertions, 6 deletions

diff --git a/models/mail/mailbox.go b/models/mail/mailbox.go
index 62e3f1d..93aa5d1 100644
--- a/models/mail/mailbox.go
+++ b/models/mail/mailbox.go
@@ -1,12 +1,17 @@
 package mail
 
-import "gorm.io/gorm"
+import (
+	domainModel "dove/models/domain"
+	"gorm.io/gorm"
+)
 
 type Mailbox struct {
 	gorm.Model
-	Address string  `gorm:"uniqueIndex;not null" json:"address"`
-	UserID  uint    `gorm:"not null" json:"user_id"`
-	User    User    `gorm:"foreignKey:UserID" json:"user"`
-	Aliases []Alias `gorm:"foreignKey:MailboxID" json:"aliases"`
-	Emails  []Email `gorm:"foreignKey:MailboxID" json:"emails"`
+	Address  string             `gorm:"uniqueIndex;not null" json:"address"`
+	UserID   uint               `gorm:"not null" json:"user_id"`
+	User     User               `gorm:"foreignKey:UserID" json:"user"`
+	DomainID uint               `gorm:"not null" json:"domain_id"`
+	Domain   domainModel.Domain `gorm:"foreignKey:DomainID" json:"domain"`
+	Aliases  []Alias            `gorm:"foreignKey:MailboxID" json:"aliases"`
+	Emails   []Email            `gorm:"foreignKey:MailboxID" json:"emails"`
 }