File storage & user management
File upload/download/management endpoints; user auth & RBAC; chunked upload & private buckets; per-app isolation.
Standard REST, unified error codes and pagination.
| Method | Path | Description |
|---|---|---|
| POST | /api/upload | File upload |
| GET | /api/file/{id} | File download/query |
| POST | /api/user/register | User register |
| GET | /api/user/{id} | User info |