Add remote browser pages and website sync

Enable managed remote browser custom pages with login autofill and add website sync workflows so external admin surfaces can be handled inside SmartUp.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Dockerfile

@@ -2,7 +2,7 @@
 FROM node:20-alpine AS frontend-build
 WORKDIR /frontend
 COPY frontend/package*.json ./
-RUN npm ci
+RUN npm ci --registry=https://registry.npmmirror.com
 COPY frontend/ .
 RUN npm run build
 
@@ -10,9 +10,23 @@ RUN npm run build
 FROM python:3.12-slim
 WORKDIR /app
 
+ENV PLAYWRIGHT_DOWNLOAD_HOST=https://npmmirror.com/mirrors/playwright
+
+RUN sed -i 's|http://deb.debian.org|https://mirrors.aliyun.com|g; s|http://security.debian.org|https://mirrors.aliyun.com|g' /etc/apt/sources.list.d/debian.sources
+
 # Install deps
 COPY backend/requirements.txt .
-RUN pip install --no-cache-dir -r requirements.txt
+RUN pip install --no-cache-dir --index-url https://pypi.tuna.tsinghua.edu.cn/simple --trusted-host pypi.tuna.tsinghua.edu.cn -r requirements.txt
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+      fonts-liberation fonts-unifont fonts-wqy-zenhei \
+      libasound2t64 libatk-bridge2.0-0 libatk1.0-0 libatspi2.0-0 \
+      libcairo2 libcups2 libdbus-1-3 libdrm2 libegl1 libfontconfig1 \
+      libfreetype6 libgbm1 libglib2.0-0t64 libgtk-3-0t64 libnspr4 libnss3 \
+      libpango-1.0-0 libx11-6 libx11-xcb1 libxcb1 libxcomposite1 \
+      libxdamage1 libxext6 libxfixes3 libxrandr2 libxshmfence1 xvfb \
+    && rm -rf /var/lib/apt/lists/*
+RUN playwright install chromium
 
 # Copy backend source
 COPY backend/ .