test: 接入 CTest 并添加基础 runtime 测试

tests/main.c

@@ -0,0 +1,10 @@
+#include "core/runtime.h"
+
+int main(void) {
+  wm_runtime_t runtime = {0};
+  wm_runtime_init(&runtime);
+
+  wm_runtime_shutdown(&runtime);
+
+  return 0;
+}