Added activities module

backend/src/domain/activity.go

@@ -0,0 +1,30 @@
+package domain
+
+import "time"
+
+type ActivityLog struct {
+	ID          int64
+	FamilyID    *int64
+	UserID      int64
+	Action      string
+	EntityType  string
+	EntityID    *int64
+	Description string
+	CreatedAt   time.Time
+}
+
+type ActivityLogCreateRequest struct {
+	FamilyID    *int64
+	UserID      int64
+	Action      string
+	EntityType  string
+	EntityID    *int64
+	Description string
+}
+
+type ActivityLogListFilter struct {
+	FamilyID *int64
+	UserID   *int64
+	Limit    int
+	Offset   int
+}