Complete build wiring and CLI file commands

Align documented commands with the CLI, enable optional GUI/test targets, and remove committed API secrets so the project is safer to build and run.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

CMakeLists.txt

@@ -6,7 +6,17 @@ set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_C_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
+option(DSTALK_BUILD_GUI "Build the SDL3 GUI frontend" ON)
+option(DSTALK_BUILD_TESTS "Build dstalk tests" ON)
+
 add_subdirectory(dstalk-core)
 add_subdirectory(dstalk-cli)
-# add_subdirectory(dstalk-gui)  # 等 SDL3 Conan 包可用后启用
-# add_subdirectory(tests)  # TODO: 引入测试框架后启用
+
+if(DSTALK_BUILD_GUI)
+    add_subdirectory(dstalk-gui)
+endif()
+
+if(DSTALK_BUILD_TESTS)
+    enable_testing()
+    add_subdirectory(tests)
+endif()