Relationship to tenders and orders

• One project → many requests (Request.project_id).
• Each request is reachable by its id as a tender (GET /tenders/{id}) or an order (GET /orders/{id}); these never collide with GET /projects/{id} because project_id and request_id are separate integer sequences.
• The tender.completed / order.completed webhooks fire per request id and carry the parent project_id on the wire, so partners can decide whether to fetch request-level data (GET /tenders/{id} / GET /orders/{id}) or project-level data (GET /projects/{id}) — or both.