postprocess-openapi: strip empty required: [] arrays

oatpp 1.3 emits `"required": []` on schemas with no required fields.
OpenAPI 3.0.x rejects this with "must NOT have fewer than 1 items",
which silently breaks strict consumers. Orval's typed fetch client
swallowed it (the violation surfaces only as a non-fatal warning), but
Orval's Zod generator (added downstream in fewo-webapp's #469 increment 2)
fails hard:

  must NOT have fewer than 1 items at /components/schemas/<DTO>/required
  must have required property '$ref'                  at /components/schemas/<DTO>
  must match exactly one schema in oneOf              at /components/schemas/<DTO>

83 of fewo-webapp's 198 DTOs trip this. Stripping the empty array (absence
of the keyword has the same semantics) is the spec-compliant fix.

Bumps to v0.4.1.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

bin/postprocess-openapi.py

@@ -43,5 +43,17 @@ for path, methods in paths.items():
         op.setdefault("operationId", op_id(method, path))
         op.setdefault("tags", [path.strip("/").split("/")[1] if "/" in path.strip("/") else "default"])
 
+# oatpp 1.3 emits `"required": []` on schemas that have no required fields.
+# OpenAPI 3.0.x rejects this (`must NOT have fewer than 1 items`), which
+# breaks strict consumers like Orval's Zod generator. Strip empty arrays —
+# absence of the keyword has the same semantics.
+schemas = spec.get("components", {}).get("schemas", {})
+stripped = 0
+for sch in schemas.values():
+    if isinstance(sch, dict) and sch.get("required") == []:
+        del sch["required"]
+        stripped += 1
+
 SRC.write_text(json.dumps(spec, indent=2))
-print(f"  postprocessed {SRC} — {len(paths)} paths")
+print(f"  postprocessed {SRC} — {len(paths)} paths"
+      + (f", stripped empty `required` from {stripped} schemas" if stripped else ""))

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@uschuster/webapp-scaffold",
-  "version": "0.4.0",
+  "version": "0.4.1",
   "description": "Shared build scripts + Vite config factories for webapp-template-derived projects.",
   "type": "module",
   "bin": {