feat: Add LSP plugin unit tests and frontend common initialization library

- Introduced `dstalk_lsp_plugin_test` for testing LSP plugin functionalities including `lsp_trim`, `lsp_frame_message`, and `lsp_parse_content_length`.
- Created `dstalk_frontend_common` static library to encapsulate shared initialization logic for frontend components (CLI, GUI, Web).
- Implemented configuration file discovery and service querying in `dstalk_frontend_init`.
- Added internal headers for LSP and Anthropic plugins to facilitate unit testing.
- Established a mailroom system for asynchronous message passing between stateless agents, enhancing coordination and context management.

dstalk_gui/CMakeLists.txt

@@ -16,5 +16,6 @@ set_target_properties(dstalk_gui PROPERTIES
 target_link_libraries(dstalk_gui
     PRIVATE
         dstalk
+        dstalk_frontend_common
         SDL3::SDL3
 )

dstalk_gui/src/main.cpp

@@ -744,8 +744,23 @@ static void processEvent(AppContext& ctx, SDL_Event& ev) {
             break;
         case SDLK_O:
             if (ctrl) {
-                // Ctrl+O：加载会话 / Ctrl+O: load session
+                // Ctrl+O：加载会话
                 if (g_session_svc && g_session_svc->load("session.json") == 0) {
+                    // BUGFIX: 从 session 历史重建 GUI 消息列表
+                    int hcount = 0;
+                    const dstalk_message_t* history = g_session_svc->history(&hcount);
+                    gs.messages.clear();
+                    for (int i = 0; i < hcount; ++i) {
+                        ChatMessage::Role r;
+                        if (std::strcmp(history[i].role, "user") == 0)
+                            r = ChatMessage::USER;
+                        else if (std::strcmp(history[i].role, "assistant") == 0)
+                            r = ChatMessage::ASSISTANT;
+                        else
+                            r = ChatMessage::SYSTEM;
+                        gs.messages.push_back(ChatMessage(r,
+                            history[i].content ? history[i].content : ""));
+                    }
                     gs.messages.push_back(ChatMessage(
                         ChatMessage::SYSTEM, "Session loaded from session.json"));
                 } else {
@@ -895,8 +910,30 @@ int main(int argc, char* argv[]) {
                     g_ai_svc->free_result(&result);
                 }
 
-                // 流式传输完成（或被取消） / Streaming completed (or cancelled)
-                if (rc != 0) {
+                // 流式传输完成（或被取消）
+                if (rc == 0) {
+                    // BUGFIX: 将用户消息和 AI 回复持久化到 session 服务
+                    if (g_session_svc) {
+                        const std::string& userContent =
+                            ctx.state.messages[ctx.state.messages.size() - 2].content;
+                        const std::string& aiContent =
+                            ctx.state.messages.back().content;
+
+                        dstalk_message_t user_msg = {
+                            "user",
+                            userContent.c_str(),
+                            nullptr, nullptr
+                        };
+                        g_session_svc->add(&user_msg);
+
+                        dstalk_message_t ai_msg = {
+                            "assistant",
+                            aiContent.c_str(),
+                            nullptr, nullptr
+                        };
+                        g_session_svc->add(&ai_msg);
+                    }
+                } else {
                     if (!ctx.state.messages.empty() &&
                         ctx.state.messages.back().role == ChatMessage::ASSISTANT) {
                         if (ctx.state.messages.back().content.empty()) {