Add configuration files and update project documentation

- Introduced .editorconfig for consistent coding styles across the project.
- Added .golangci.yml for Go linting configuration.
- Updated AGENTS.md to clarify project structure and components.
- Enhanced CONTRIBUTING.md with Makefile usage for common tasks.
- Updated Dockerfiles to use Go 1.24 and improved build instructions.
- Refined README.md and deployment documentation for clarity.
- Added testing documentation in testing.md for backend and frontend tests.
- Introduced Makefile for streamlined development commands and tasks.

Makefile

@@ -0,0 +1,26 @@
+.PHONY: dev build test lint fmt generate-frontend clean
+
+dev:
+	docker compose -f docker-compose.dev.yml up
+
+build:
+	docker compose -f docker-compose.prod.yml build
+
+test:
+	go test ./...
+
+lint:
+	golangci-lint run
+	npm --prefix frontend-nuxt run lint
+
+fmt:
+	go fmt ./...
+	npm --prefix frontend-nuxt run format
+
+generate-frontend:
+	npm --prefix frontend-nuxt run generate
+	rm -rf frontend/*
+	cp -a frontend-nuxt/.output/public/. frontend/
+
+clean:
+	rm -rf frontend-nuxt/.nuxt frontend-nuxt/.output frontend-nuxt/.cache hnh-map