Enhance development workflow with Docker integration

- Updated CONTRIBUTING.md to clarify the use of Makefile targets for running tasks inside Docker, eliminating the need for local Go or Node installations.
- Introduced docker-compose.tools.yml for backend and frontend tools, allowing for streamlined testing, linting, and formatting.
- Created Dockerfile.tools to set up a Go environment with necessary tools for testing and linting.
- Modified Makefile to include separate targets for backend and frontend tests, improving clarity and usability.
- Updated documentation in development.md and testing.md to reflect the new Docker-based workflow for running tests and development tasks.

Makefile

@@ -1,4 +1,6 @@
-.PHONY: dev build test lint fmt generate-frontend clean
+.PHONY: dev build test test-backend test-frontend lint fmt generate-frontend clean
+
+TOOLS_COMPOSE = docker compose -f docker-compose.tools.yml
 
 dev:
 	docker compose -f docker-compose.dev.yml up
@@ -6,16 +8,21 @@ dev:
 build:
 	docker compose -f docker-compose.prod.yml build
 
-test:
-	go test ./...
+test: test-backend test-frontend
+
+test-backend:
+	$(TOOLS_COMPOSE) run --rm backend-tools go test ./...
+
+test-frontend:
+	$(TOOLS_COMPOSE) run --rm frontend-tools sh -c "npm ci && npm test"
 
 lint:
-	golangci-lint run
-	npm --prefix frontend-nuxt run lint
+	$(TOOLS_COMPOSE) run --rm backend-tools golangci-lint run
+	$(TOOLS_COMPOSE) run --rm frontend-tools sh -c "npm ci && npm run lint"
 
 fmt:
-	go fmt ./...
-	npm --prefix frontend-nuxt run format
+	$(TOOLS_COMPOSE) run --rm backend-tools go fmt ./...
+	$(TOOLS_COMPOSE) run --rm frontend-tools sh -c "npm ci && npm run format"
 
 generate-frontend:
 	npm --prefix frontend-nuxt run generate