chore: import upstream snapshot with attribution

tests/unit/openapi-spec-route.test.ts

@@ -0,0 +1,15 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+
+const { GET } = await import("../../src/app/api/openapi/spec/route.ts");
+
+test("openapi spec route resolves the repository spec file and returns a parsed catalog", async () => {
+  const response = await GET();
+  assert.equal(response.status, 200);
+
+  const payload = (await response.json()) as any;
+  assert.equal(typeof payload.info, "object");
+  assert.ok(Array.isArray(payload.endpoints));
+  assert.ok(Array.isArray(payload.schemas));
+  assert.ok(payload.endpoints.length > 0);
+});