feat: add health check

Summary:

Test Plan:

src/types/schema.ts

@@ -0,0 +1,10 @@
+import { type ZodSchema, z } from "zod";
+
+export const SuccessResponse = { success: true } as const;
+export const SuccessResponseSchema = <T extends ZodSchema>(schema?: T) => {
+  if (!schema) {
+    return z.object({ success: z.literal(true) });
+  }
+
+  return z.object({ success: z.literal(true), result: schema });
+};