feat: initial IPFS Portal — Next.js frontend for remote IPFS node management

Multi-file upload with Quick Upload + Crypto Payment tabs.
Dashboard with live IPFS metrics, Explorer, Peers, Pins, History, Settings pages.
Docker deploy (standalone output), full test suite (16 Playwright tests).
Payment integration via IPFSPortalPayment + MockUSDC contracts on zkSync.

Dockerfile

@@ -0,0 +1,30 @@
+# ── IPFS Portal — Multi-stage Docker Build ──
+
+# ---- Build ----
+FROM node:22-alpine AS builder
+WORKDIR /app
+
+ENV DOCKER_BUILD=true
+
+COPY package.json package-lock.json ./
+RUN npm ci
+
+COPY . .
+RUN npm run build
+
+# ---- Production ----
+FROM node:22-alpine
+WORKDIR /app
+
+ENV NODE_ENV=production
+ENV NEXT_TELEMETRY_DISABLED=1
+
+# Copy standalone output from builder
+COPY --from=builder /app/.next/standalone ./
+COPY --from=builder /app/.next/static ./.next/static
+COPY --from=builder /app/public ./public
+
+ENV PORT=3445
+EXPOSE 3445
+
+CMD ["node", "server.js"]