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.

README.md

@@ -2,14 +2,14 @@
 
 Automapper server for HnH, (mostly) compatible with https://github.com/APXEOLOG/hnh-auto-mapper-server
 
-Docker image can be built from sources, or is available at https://hub.docker.com/r/andyleap/hnh-auto-mapper 
-(automatically built by Docker's infrastructure from the github source)
+The Docker image is built from sources in this repository.
 
 **Ports:** In production the app listens on **8080**. For local development with `docker-compose.dev.yml`, the frontend runs on **3000** and the backend on **3080** (to avoid conflicts with other services on 8080).
 
 Run it via whatever you feel like. The app expects `/map` to be mounted as a volume (database and images are stored here):
 
-    docker run -v /srv/hnh-map:/map -p 80:8080 andyleap/hnh-auto-mapper:v-4
+    docker build -t hnh-map .
+    docker run -v /srv/hnh-map:/map -p 80:8080 hnh-map
 
 Set it up under a domain name however you prefer (nginx reverse proxy, traefik, caddy, apache, whatever) and 
 point your auto-mapping supported client at it (like Purus pasta).