Route all package mirrors through local Nexus

Point Docker, NuGet, and npm pulls at the Nexus group repos on
171.22.25.73:8081 for both CI/CD and local builds, so the pipeline and
developers no longer depend on Docker Hub, MCR, nuget.org, or npmjs.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docker/koja/Dockerfile

@@ -1,9 +1,9 @@
-ARG NODE_IMAGE=docker-mirror.liara.ir/library/node:20-alpine
+ARG NODE_IMAGE=171.22.25.73:8081/repository/docker-group/node:20-alpine
 
 FROM ${NODE_IMAGE} AS deps
 WORKDIR /app
 COPY web/koja/package*.json ./
-ARG NPM_REGISTRY=https://package-mirror.liara.ir/repository/npm/
+ARG NPM_REGISTRY=http://171.22.25.73:8081/repository/npm-group/
 RUN npm install --legacy-peer-deps --ignore-scripts --registry ${NPM_REGISTRY}
 
 FROM ${NODE_IMAGE} AS builder