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/gobinary/Dockerfile

@@ -2,8 +2,8 @@
 # Универсальная сборка бинарей cmd/* (ARG BIN) или всех сразу (target build-all).
 # Воркеры (runtime): distroless static. api/all (runtime-birdc): debian-slim + birdc.
 # CI: docker buildx bake -f deploy/docker/docker-bake.hcl
-ARG BASE_GOLANG=public.ecr.aws/docker/library/golang:1.24-alpine
-ARG BASE_DEBIAN=public.ecr.aws/docker/library/debian:bookworm-slim
+ARG BASE_GOLANG=docker.io/library/golang:1.24-alpine
+ARG BASE_DEBIAN=docker.io/library/debian:bookworm-slim
 ARG BASE_DISTROLESS=gcr.io/distroless/static-debian12:nonroot
 
 FROM ${BASE_GOLANG} AS deps