Add unit tests for OpenAI plugin and establish coding standards

- Introduced comprehensive unit tests for the OpenAI plugin, covering SSE parsing, sentinel matching, delta extraction, request building, and more.
- Created a new markdown file detailing coding and naming conventions for the dstalk project, including guidelines for comments, naming rules, code organization, and memory management practices.

tests/CMakeLists.txt

@@ -152,31 +152,31 @@ target_link_libraries(dstalk-anthropic-plugin-test
 add_test(NAME dstalk-anthropic-plugin-test COMMAND dstalk-anthropic-plugin-test)
 
 # ============================================================
-# dstalk-deepseek-plugin-test — DeepSeek AI 插件单元测试
+# dstalk-openai-plugin-test — OpenAI 兼容 AI 插件单元测试
 # W21.6 (qa-wang): 通过 #include source 访问 static 函数
 # ============================================================
 
-add_executable(dstalk-deepseek-plugin-test
-    deepseek_plugin_test.cpp
+add_executable(dstalk-openai-plugin-test
+    openai_plugin_test.cpp
 )
 
-target_include_directories(dstalk-deepseek-plugin-test
+target_include_directories(dstalk-openai-plugin-test
     PRIVATE ${CMAKE_SOURCE_DIR}/dstalk-core/include
 )
 
-target_compile_definitions(dstalk-deepseek-plugin-test
+target_compile_definitions(dstalk-openai-plugin-test
     PRIVATE
         BOOST_JSON_HEADER_ONLY
         BOOST_ALL_NO_LIB
 )
 
-target_link_libraries(dstalk-deepseek-plugin-test
+target_link_libraries(dstalk-openai-plugin-test
     PRIVATE
         dstalk
         boost::boost
 )
 
-add_test(NAME dstalk-deepseek-plugin-test COMMAND dstalk-deepseek-plugin-test)
+add_test(NAME dstalk-openai-plugin-test COMMAND dstalk-openai-plugin-test)
 
 # ============================================================
 # dstalk-network-plugin-test — Network 插件单元测试