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/client_test.go

@@ -58,9 +58,11 @@ func TestClientLocate_Found(t *testing.T) {
 	ctx := context.Background()
 	gd := app.GridData{ID: "g1", Map: 1, Coord: app.Coord{X: 2, Y: 3}}
 	raw, _ := json.Marshal(gd)
-	st.Update(ctx, func(tx *bbolt.Tx) error {
+	if err := st.Update(ctx, func(tx *bbolt.Tx) error {
 		return st.PutGrid(tx, "g1", raw)
-	})
+	}); err != nil {
+		t.Fatal(err)
+	}
 	result, err := client.Locate(ctx, "g1")
 	if err != nil {
 		t.Fatal(err)