优化JSON问题

src/CMakeLists.txt

@@ -48,5 +48,8 @@ install(DIRECTORY
         ${PROJECT_SOURCE_DIR}/include/util 
         ${PROJECT_SOURCE_DIR}/include/net 
 DESTINATION include)
-
+# nlohmann/json.hpp：ylib::json 依赖，需一并安装到系统目录
+install(DIRECTORY ${PROJECT_SOURCE_DIR}/3rdparty/nlohmann
+        DESTINATION include
+        FILES_MATCHING PATTERN "*.hpp")