Seeding nodes lease first, connect for the lease, close when idle

A failed NNTP login gives the range back uncounted (no attempt used), and a
node with nothing to lease holds no connection. Replaces log-in-before-lease,
which kept idle connections and logged in again every minute while idle.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/controllers/seed_controller.ts

@@ -39,11 +39,12 @@ export default class SeedController {
     })
   }
 
-  /** POST /api/v1/seed/ranges/:id/release { error? } */
+  /** POST /api/v1/seed/ranges/:id/release { error?, uncounted? } */
   async release({ seedNode, params, request, response }: HttpContext) {
     const error = request.input('error')
+    const uncounted = request.input('uncounted') === true
     return this.leased(response, async () => {
-      await SeedOrchestrator.release(seedNode.id, Number(params.id), typeof error === 'string' ? error : undefined)
+      await SeedOrchestrator.release(seedNode.id, Number(params.id), typeof error === 'string' ? error : undefined, uncounted)
       return { ok: true }
     })
   }