fix(docker): update base image references to Docker Hub

- Changed base image references in `docker-bake.hcl`, Dockerfiles, and `mirror-base-images.sh` from public ECR to Docker Hub to avoid 429 errors and improve reliability.
- Updated README documentation to reflect the new source for base images, clarifying the mirroring process and behavior when tags already exist.

deploy/docker/evobgp-web/Dockerfile

@@ -1,8 +1,8 @@
 # syntax=docker/dockerfile:1.7
 # React + Vite статическая панель EvoBGP + nginx.
 # Финальный stage `web` ожидает bake-контекст web-artifacts (= target:web-build).
-ARG BASE_NODE=public.ecr.aws/docker/library/node:22-alpine
-ARG BASE_NGINX=public.ecr.aws/docker/library/nginx:1.27-alpine
+ARG BASE_NODE=docker.io/library/node:22-alpine
+ARG BASE_NGINX=docker.io/library/nginx:1.27-alpine
 
 FROM ${BASE_NODE} AS deps
 WORKDIR /repo