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/web/Dockerfile

@@ -0,0 +1,36 @@
+FROM node:20-alpine AS deps
+WORKDIR /app
+COPY web/dashboard/package*.json ./
+RUN npm config set registry https://registry.npmmirror.com \
+    && npm install --legacy-peer-deps --ignore-scripts
+
+FROM node:20-alpine AS builder
+WORKDIR /app
+
+ARG NEXT_PUBLIC_API_URL=http://localhost:5080
+ENV NEXT_PUBLIC_API_URL=$NEXT_PUBLIC_API_URL
+ENV NEXT_TELEMETRY_DISABLED=1
+
+COPY --from=deps /app/node_modules ./node_modules
+COPY web/dashboard/ .
+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"]