chore: add helix-api and workspace config to monorepo

helix-api/docs/README.md

@@ -0,0 +1,23 @@
+# Helix API Docs
+
+Vite + React Router + Fumadocs documentation app with OpenAPI support.
+
+## Run
+
+```bash
+pnpm install
+pnpm dev
+```
+
+Open these pages:
+
+- `/api-reference`: OpenAPI interactive reference
+- `/docs`: MDX docs pages
+
+## Edit OpenAPI
+
+Manually maintain:
+
+- `openapi/openapi.yaml`
+
+After changes, refresh the `/api-reference` page.