Refactor Docker and Makefile configurations for improved build processes

- Updated docker-compose.tools.yml to mount source code at /src and set working directory for backend tools, ensuring proper Go module caching.
- Modified Dockerfile.tools to install the latest golangci-lint version compatible with Go 1.24 and adjusted working directory for build-time operations.
- Enhanced Makefile to build backend tools before running tests and linting, ensuring dependencies are up-to-date and improving overall workflow efficiency.
- Refactored test and handler files to include error handling for database operations, enhancing reliability and debugging capabilities.

internal/app/services/export_test.go

@@ -47,12 +47,14 @@ func TestExport_WithGrid(t *testing.T) {
 	gdRaw, _ := json.Marshal(gd)
 	mi := app.MapInfo{ID: 1, Name: "test", Hidden: false}
 	miRaw, _ := json.Marshal(mi)
-	st.Update(ctx, func(tx *bbolt.Tx) error {
+	if err := st.Update(ctx, func(tx *bbolt.Tx) error {
 		if err := st.PutGrid(tx, "g1", gdRaw); err != nil {
 			return err
 		}
 		return st.PutMap(tx, 1, miRaw)
-	})
+	}); err != nil {
+		t.Fatal(err)
+	}
 	var buf bytes.Buffer
 	err := export.Export(ctx, &buf)
 	if err != nil {