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.

dstalk-web/CMakeLists.txt

@@ -0,0 +1,27 @@
+# ============================================================
+# dstalk-web — Web 前端 / Web frontend (Boost.Beast HTTP + SSE)
+# ============================================================
+
+find_package(Boost REQUIRED CONFIG)
+
+add_executable(dstalk-web
+    src/main.cpp
+)
+
+set_target_properties(dstalk-web PROPERTIES
+    RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin
+)
+
+target_compile_features(dstalk-web PRIVATE cxx_std_20)
+
+target_link_libraries(dstalk-web
+    PRIVATE
+        dstalk
+        boost::boost
+        dstalk_boost_config
+)
+
+# Windows: Boost.Asio 需要 Winsock / Boost.Asio requires Winsock
+if(WIN32)
+    target_link_libraries(dstalk-web PRIVATE ws2_32)
+endif()