feat: 新增车辆心跳数据查询接口

- list_vehicle_heartbeat: 查询车辆心跳数据列表 (/api/vehicle/heartbeat/list)
- 支持分页、城市筛选、操作员筛选

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/index.ts

@@ -151,6 +151,20 @@ const TOOLS = [
     },
     endpoint: { method: "GET", path: "/api/vehicle/path/playback" },
   },
+  {
+    name: "list_vehicle_heartbeat",
+    description: "查询车辆心跳数据列表，支持分页",
+    inputSchema: {
+      type: "object",
+      properties: {
+        cityId: { type: "integer", description: "城市ID" },
+        operator: { type: "string", description: "操作员" },
+        page: { type: "integer", default: 1, description: "页码" },
+        pageSize: { type: "integer", default: 20, description: "每页数量" },
+      },
+    },
+    endpoint: { method: "GET", path: "/api/vehicle/heartbeat/list" },
+  },
 
   // === 运单监控 ===
   {