feat(docker): multi-stage Dockerfiles with npmmirror registry

Rewrites dashboard and finder Dockerfiles to use a clean multi-stage
build (deps → builder → runner) that installs npm packages inside
Alpine Linux, avoiding the SWC musl binary issue when building from
Windows host. Uses registry.npmmirror.com for reliable installs from
restricted networks (Iran).

- docker/api/Dockerfile: .NET 10 multi-stage build
- docker/web/Dockerfile: Node 20-alpine multi-stage, npmmirror
- docker/finder/Dockerfile: Node 20-alpine multi-stage, npmmirror
- docker/website/Dockerfile: marketing website build
- scripts/: PowerShell helper scripts for local dev

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

docker/admin-web/Dockerfile

@@ -0,0 +1,35 @@
+FROM node:20-alpine AS builder
+WORKDIR /app
+
+COPY web/admin/ .
+
+ARG NEXT_PUBLIC_ADMIN_API_URL=http://localhost:5081
+ENV NEXT_PUBLIC_ADMIN_API_URL=$NEXT_PUBLIC_ADMIN_API_URL
+
+RUN NEXT_VER=$(node -e "process.stdout.write(require('./node_modules/next/package.json').version)") \
+    && rm -rf node_modules/@next/swc-win32-* node_modules/@next/swc-darwin-* 2>/dev/null; \
+    ls node_modules/@next/swc-linux-x64-musl 2>/dev/null \
+    || npm install --no-save --ignore-scripts "@next/swc-linux-x64-musl@${NEXT_VER}"
+
+ENV NEXT_TELEMETRY_DISABLED=1
+RUN npm run build
+
+FROM node:20-alpine AS runner
+WORKDIR /app
+
+ENV NODE_ENV=production
+ENV PORT=3000
+ENV HOSTNAME=0.0.0.0
+ENV NEXT_TELEMETRY_DISABLED=1
+
+RUN addgroup --system --gid 1001 nodejs \
+    && adduser --system --uid 1001 nextjs
+
+COPY --from=builder /app/public ./public
+COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
+COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
+
+USER nextjs
+EXPOSE 3000
+
+CMD ["node", "server.js"]