Get sandbox developer project lead routing

Returns public-safe lead-routing and CRM delivery metadata for one deterministic sandbox developer project when the authenticated automation client has developers.leads.route. External URL: /v1/developers/current/projects/{id}/lead-routing. Current Next.js implementation path: /api/platform/v1/developers/current/projects/[id]/lead-routing. This read-only route exposes routing profile metadata, lead-capture contract fields, redacted payload summaries, CRM delivery state, retryability evidence, and side-effect blocking. It never captures leads, routes live leads, exports contact fields, retries CRM delivery, exposes buyer identity, broker contact details, private notes, CRM destination credentials, raw CRM payloads, write controls, or live routing feeds.