fix: Add nixpacks configuration for Astro deployment

dealplustech-astro/node_modules/zod-to-json-schema/dist/esm/parsers/default.js

@@ -0,0 +1,7 @@
+import { parseDef } from "../parseDef.js";
+export function parseDefaultDef(_def, refs) {
+    return {
+        ...parseDef(_def.innerType._def, refs),
+        default: _def.defaultValue(),
+    };
+}