Organize backend into product executable and shared Go modules

backend/shared/database/repository/builder/patch.go

@@ -0,0 +1,16 @@
+package builder
+
+import "go.mongodb.org/mongo-driver/v2/bson"
+
+// Patch defines operations for constructing partial update documents.
+// Each builder method returns the same Patch instance to allow chaining.
+type Patch interface {
+	Set(field Field, value any) Patch
+	Inc(field Field, value any) Patch
+	Unset(field Field) Patch
+	Rename(field Field, newName string) Patch
+	Push(field Field, value any) Patch
+	Pull(field Field, value any) Patch
+	AddToSet(field Field, value any) Patch
+	Build() bson.D
+}