**Untested! ** Add restore functionality for archived messages

- Added `RestoreMessageHandler` and route at `/account/messages/restore`
- Updated `users_messages` table to support `archived_at` reset
- Added restore button to archived messages template
- Ensures archived messages can be moved back into inbox

models/syndicate.go

@@ -0,0 +1,29 @@
+package models
+
+import "time"
+
+type Syndicate struct {
+	ID          int
+	OwnerID     int
+	Name        string
+	Description string
+	CreatedBy   int
+	CreatedAt   time.Time
+}
+
+type SyndicateMember struct {
+	ID          int
+	SyndicateID int
+	UserID      int
+	Role        string
+	JoinedAt    time.Time
+}
+
+type SyndicateInvite struct {
+	ID            int
+	SyndicateID   int
+	InvitedUserID int
+	SentByUserID  int
+	Status        string
+	CreatedAt     time.Time
+}