Add Mac client mode and simplify local proxy UI

Dockerfile.client

@@ -0,0 +1,54 @@
+ARG NODE_BUILD_IMAGE=node:20-alpine
+ARG RUNTIME_IMAGE=debian:bookworm-slim
+
+FROM ${NODE_BUILD_IMAGE} AS web-build
+WORKDIR /src
+COPY package.json package-lock.json ./
+RUN npm ci
+COPY index.html vite.config.js ./
+COPY src/web ./src/web
+RUN npm run build
+
+FROM ${RUNTIME_IMAGE}
+ARG SINGBOX_VERSION=1.12.13
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends ca-certificates curl dumb-init nodejs tar \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN set -eux; \
+    arch="$(dpkg --print-architecture)"; \
+    case "$arch" in \
+      amd64) sb_arch="amd64" ;; \
+      arm64) sb_arch="arm64" ;; \
+      *) echo "Unsupported architecture: $arch" >&2; exit 1 ;; \
+    esac; \
+    curl -fsSL "https://github.com/SagerNet/sing-box/releases/download/v${SINGBOX_VERSION}/sing-box-${SINGBOX_VERSION}-linux-${sb_arch}.tar.gz" -o /tmp/sing-box.tgz; \
+    tar -xzf /tmp/sing-box.tgz -C /tmp; \
+    mv "/tmp/sing-box-${SINGBOX_VERSION}-linux-${sb_arch}/sing-box" /usr/local/bin/sing-box; \
+    chmod +x /usr/local/bin/sing-box; \
+    rm -rf /tmp/sing-box*
+
+WORKDIR /app
+COPY --from=web-build /src/dist /app/dist
+COPY package.json /app/package.json
+COPY src/server /app/src/server
+COPY entrypoint.client.sh /entrypoint.client.sh
+
+RUN chmod +x /entrypoint.client.sh \
+    && mkdir -p /etc/sing-box /var/lib/vpn-proxy /var/lib/sing-box
+
+ENV APP_MODE=client \
+    PORT=3456 \
+    PROXY_PORT=8080 \
+    PROXY_BIND_IP=0.0.0.0 \
+    DATA_DIR=/var/lib/vpn-proxy \
+    SING_BOX_CONFIG=/etc/sing-box/config.json \
+    SING_BOX_CACHE=/var/lib/sing-box/cache.db \
+    RULE_SET_DOWNLOAD_DETOUR=vpn \
+    ROUTING_RU_DIRECT=true \
+    LOG_LEVEL=info
+
+EXPOSE 3456 8080
+
+ENTRYPOINT ["dumb-init", "/entrypoint.client.sh"]