Add metadata validation script and module documentation

- Introduced a new Python script `check_agents_metadata.py` for validating agent metadata, including YAML parsing, rating ranges, and cross-references.
- Added usage instructions and exit codes for the script.
- Created a new markdown file `模块目录和功能说明.md` to outline the directory structure and functionality of the modules.
- Added a text file `说明此文件不可AI修改.txt` to specify that certain files should not be modified by AI, including important information about the `dstalk` framework and its modules.

CMakeLists.txt

@@ -8,6 +8,7 @@ set(CMAKE_C_STANDARD 11)
 set(CMAKE_C_STANDARD_REQUIRED ON)
 
 option(DSTALK_BUILD_GUI "Build the SDL3 GUI frontend" OFF)
+option(DSTALK_BUILD_WEB "Build the web UI frontend" OFF)
 option(DSTALK_BUILD_TESTS "Build dstalk tests" ON)
 
 add_subdirectory(dstalk-core)
@@ -18,6 +19,10 @@ if(DSTALK_BUILD_GUI)
     add_subdirectory(dstalk-gui)
 endif()
 
+if(DSTALK_BUILD_WEB)
+    add_subdirectory(dstalk-web)
+endif()
+
 if(DSTALK_BUILD_TESTS)
     enable_testing()
     add_subdirectory(tests)