feat: migrate from Elysia Eden to Contract-First API (OpenAPI)

scripts/generate-schema.ts

@@ -0,0 +1,7 @@
+import api from "../src/api";
+
+const response = await api.handle(new Request("http://localhost/api/docs/json"));
+const schema = await response.json();
+
+await Bun.write("generated/schema.json", JSON.stringify(schema, null, 2));
+console.log("✅ OpenAPI schema generated at generated/schema.json");