#8: implement ManageSieve protocol server (RFC 5804)

services/protocols/internal/domain/entity/sieve_script.go

@@ -0,0 +1,12 @@
+package entity
+
+import "github.com/google/uuid"
+
+// SieveScript represents a user's Sieve filtering script entity.
+type SieveScript struct {
+	ID        uuid.UUID
+	MailboxID uuid.UUID
+	Name      string
+	Script    string
+	IsActive  bool
+}