chore: move the go code into a subfolder

apps/api/internal/user/model/user_changes.go

@@ -0,0 +1,21 @@
+package model
+
+import (
+	"google.golang.org/protobuf/types/known/timestamppb"
+)
+
+type UserChanges struct {
+	Changes      []*UserChange
+	LastSequence uint64
+}
+
+type UserChange struct {
+	ChangeDate        *timestamppb.Timestamp `json:"changeDate,omitempty"`
+	EventType         string                 `json:"eventType,omitempty"`
+	Sequence          uint64                 `json:"sequence,omitempty"`
+	ModifierID        string                 `json:"modifierUser,omitempty"`
+	ModifierName      string                 `json:"-"`
+	ModifierLoginName string                 `json:"-"`
+	ModifierAvatarURL string                 `json:"-"`
+	Data              interface{}            `json:"data,omitempty"`
+}