feat: add OpenAI-compatible AI provider plugin with SSE streaming support

- Implemented the OpenAI-compatible AI provider plugin, including configuration, chat, and chat_stream functionalities.
- Added support for SSE streaming and tool calls.
- Integrated Boost.JSON for JSON handling.
- Created CMake configuration for the plugin.
- Added error handling and logging throughout the plugin.

dstalk_cli/CMakeLists.txt

@@ -0,0 +1,17 @@
+# ============================================================
+# dstalk_cli — 命令行前端 (ANSI 转义码)
+# ============================================================
+
+add_executable(dstalk_cli
+    src/main.cpp
+)
+
+set_target_properties(dstalk_cli PROPERTIES
+    RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin
+)
+
+find_package(Boost REQUIRED CONFIG)
+
+target_link_libraries(dstalk_cli
+    PRIVATE dstalk boost::boost dstalk_boost_config
+)