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.

docs/explanation/plugin-lifecycle.md

@@ -52,7 +52,7 @@ Host 调用 `load_plugin(path)`，由 `PluginLoader` 执行：
 { "http", "config", NULL }
 ```
 
-依赖名称与目标插件的 `info->name` 字段匹配（如 `"file-io"` 不是 DLL 的文件名），因此依赖声明和插件命名必须一致。
+依赖名称与目标插件的 `info->name` 字段匹配（如 `"file_io"` 不是 DLL 的文件名），因此依赖声明和插件命名必须一致。
 
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