feat: add health check

Summary:

Test Plan:

src/controllers/health-check/index.ts

@@ -0,0 +1,24 @@
+import { OpenAPIHono, createRoute } from "@hono/zod-openapi";
+
+import { SuccessResponse, SuccessResponseSchema } from "~/types/schema";
+
+const app = new OpenAPIHono();
+
+const route = createRoute({
+  method: "get",
+  path: "/",
+  responses: {
+    200: {
+      content: {
+        "application/json": {
+          schema: SuccessResponseSchema(),
+        },
+      },
+      description: "Retrieve the user",
+    },
+  },
+});
+
+app.openapi(route, (c) => c.json(SuccessResponse, 200));
+
+export default app;