3x-ui 式共享节点改造：nodes 状态机 + nodeClients 各自凭据

- 移除 VMess 协议
- VLESS/SS2022 按用户流量统计（AnyTLS 日志解析，SS 节点级）
- sing-box v2ray_api stats 支持
- 内存优化：面板 128M，agent 64M，sing-box 64M

.github/workflows/ci.yml

@@ -37,14 +37,3 @@ jobs:
           sudo env PATH="$PATH" NG_STATS_SOURCE="$GITHUB_WORKSPACE/agent/stats-query.go" bash scripts/agent-singbox.sh install
       - name: AnyTLS handshake and two-way traffic counters
         run: bash scripts/anytls-smoke.sh
-      - name: Install Xray 26.3.27 for Hysteria 2 interoperability
-        run: |
-          mkdir -p "$RUNNER_TEMP/nexusgate-xray"
-          curl -fL --retry 3 https://github.com/XTLS/Xray-core/releases/download/v26.3.27/Xray-linux-64.zip -o "$RUNNER_TEMP/nexusgate-xray.zip"
-          unzip -q "$RUNNER_TEMP/nexusgate-xray.zip" xray -d "$RUNNER_TEMP/nexusgate-xray"
-      - name: Build QUIC-enabled sing-box test client
-        run: |
-          mkdir -p "$RUNNER_TEMP/nexusgate-hy2-client"
-          GOBIN="$RUNNER_TEMP/nexusgate-hy2-client" GOMAXPROCS=2 go install -trimpath -ldflags='-s -w' -p 2 -tags with_quic github.com/sagernet/sing-box/cmd/sing-box@v1.12.23
-      - name: Hysteria 2 handshake, UDP listener and two-way counters
-        run: NG_XRAY_BIN="$RUNNER_TEMP/nexusgate-xray/xray" NG_SINGBOX_BIN="$RUNNER_TEMP/nexusgate-hy2-client/sing-box" bash scripts/hy2-smoke.sh