Add webmail email management templates and storage utilities

- Implemented email listing template with read/unread and star functionality.
- Created empty state template for webmail when no emails are present.
- Developed folder navigation template for managing email folders.
- Added email preview template for displaying selected email details.
- Introduced storage utilities for managing email files, including creation, reading, moving, and deletion.
- Defined constants for storage paths and error messages related to file operations.

2 files changed, 16 insertions, 0 deletions

diff --git a/models/mail/email.go b/models/mail/email.go
index 4b8b55e..b0cc27e 100644
--- a/models/mail/email.go
+++ b/models/mail/email.go
@@ -6,6 +6,9 @@ type Email struct {
 	gorm.Model
 	MailboxID       uint    `gorm:"not null;index" json:"mailbox_id"`
 	Mailbox         Mailbox `gorm:"foreignKey:MailboxID" json:"mailbox"`
+	FolderID        uint    `gorm:"not null;index" json:"folder_id"`
+	Folder          Folder  `gorm:"foreignKey:FolderID" json:"folder"`
+	IsStarred       bool    `gorm:"default:false;index" json:"is_starred"`
 	MessageID       string  `gorm:"index" json:"message_id"`
 	Filename        string  `gorm:"uniqueIndex;not null" json:"filename"`
 	FromAddress     string  `gorm:"not null" json:"from_address"`
diff --git a/models/mail/folder.go b/models/mail/folder.go
new file mode 100644
index 0000000..3c46bec
--- /dev/null
+++ b/models/mail/folder.go
@@ -0,0 +1,13 @@
+package mail
+
+import "gorm.io/gorm"
+
+type Folder struct {
+	gorm.Model
+	Name      string  `gorm:"not null" json:"name"`
+	Slug      string  `gorm:"not null;index" json:"slug"`
+	MailboxID uint    `gorm:"not null;index" json:"mailbox_id"`
+	Mailbox   Mailbox `gorm:"foreignKey:MailboxID" json:"mailbox"`
+	IsSystem  bool    `gorm:"not null;default:false" json:"is_system"`
+	Position  int     `gorm:"not null;default:0" json:"position"`
+}