refactor: 迁移 CMake 到模块化目录构建并添加新入口

src/main.c

@@ -0,0 +1,57 @@
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "base/log.h"
+#include "config/runtime_config.h"
+#include "core/backend.h"
+#include "core/runtime.h"
+
+static void bootstrap(runtime_t *runtime) {
+  auto backend = backend_create(nullptr);
+  auto detect = backend_detect(backend);
+  if (!backend || !detect || detect->output_count == 0) {
+    fatal("backend detect failed");
+  }
+
+  runtime_init_desc_t desc = {
+    .backend = backend,
+    .outputs = detect->outputs,
+    .output_count = detect->output_count,
+  };
+  if (!runtime_config_load(nullptr, &desc)) {
+    fatal("failed to build runtime inputs");
+  }
+
+  backend = nullptr;
+
+  bool inited = runtime_init(runtime, &desc);
+
+  runtime_init_desc_cleanup(&desc);
+  backend_detect_destroy(detect);
+
+  if (!inited) {
+    fatal("runtime init failed");
+  }
+}
+
+char **cmd_argv = nullptr;
+
+int main(int argc, char *argv[]) {
+  cmd_argv = argv;
+
+  runtime_t runtime = {0};
+
+  bootstrap(&runtime);
+  runtime_setup(&runtime);
+  runtime_scan(&runtime);
+  runtime_run(&runtime);
+  runtime_shutdown(&runtime);
+
+  if (runtime.will_restart) {
+    execvp(cmd_argv[0], cmd_argv);
+    fatal("execvp() failed: %s", strerror(errno));
+  }
+
+  return 0;
+}