feat: 搭建前后端可执行程序示例

src/shared/api.ts

@@ -0,0 +1,23 @@
+export type RuntimeMode = "development" | "production" | "test";
+
+export interface DemoResponse {
+  message: string;
+  runtime: {
+    mode: RuntimeMode;
+    bunVersion: string;
+    platform: string;
+    arch: string;
+    timestamp: string;
+  };
+}
+
+export interface HealthResponse {
+  ok: true;
+  service: "gateway-checker";
+  timestamp: string;
+}
+
+export interface ApiErrorResponse {
+  error: string;
+  status: number;
+}