feat: 内置虾盘云 + 设备指纹绑定 + Release 流水线

- 新增 portable/lib/{fingerprint,xiapan-client,bootstrap-xiapan}.mjs：
  跨平台设备指纹（Win USB/disk + Mac UUID + Linux machine-id + seed 兜底）
  生成 sk-uc-{fingerprint} 形式的虾盘云 apiKey，启动时 merge 到 openclaw.json
- Config.html 顶部新增「已绑定虾盘云」横幅：指纹来源 + Key + 余额 + 充值/解绑
- config-server 增加 /api/xiapan/{status,bind,unbind} 三个端点
- Electron app 在 whenReady 调 bootstrap，新增 sync-lib.js 让 build 前自动同步
- 锁 OpenClaw 版本到 2026.4.29（OPENCLAW_VERSION 单一来源）
- 删除死代码 portable/充值.html
- 新增 .github/workflows/release.yml：tag 触发，出 portable zip + Electron exe/dmg
- README 增加内置虾盘云说明 + 直接下载发行版指引

portable/setup.sh

@@ -109,15 +109,20 @@ else
     echo -e "  ${CYAN}↓${NC} 安装 OpenClaw..."
     mkdir -p "$CORE_DIR"
 
-    # Init package.json if not exists
+    # Init package.json if not exists (pinned OpenClaw version from OPENCLAW_VERSION)
+    OPENCLAW_VERSION_FILE="$(dirname "$0")/../OPENCLAW_VERSION"
+    OPENCLAW_VERSION="2026.4.29"
+    if [ -f "$OPENCLAW_VERSION_FILE" ]; then
+        OPENCLAW_VERSION="$(tr -d '[:space:]' < "$OPENCLAW_VERSION_FILE")"
+    fi
     if [ ! -f "$CORE_DIR/package.json" ]; then
-        cat > "$CORE_DIR/package.json" << 'PKGJSON'
+        cat > "$CORE_DIR/package.json" << PKGJSON
 {
   "name": "u-claw-core",
   "version": "1.0.0",
   "private": true,
   "dependencies": {
-    "openclaw": "latest"
+    "openclaw": "$OPENCLAW_VERSION"
   }
 }
 PKGJSON