Release v2.1.0-beta.11

Highlights

feat(admin-upload): improve upload management workflow (d1ea055)
fix: address Codex PR review comments (03021d4)
fix: final review fixes — secure cookie, test args, instance ID collision (8faf8b5)
feat: add telemetry-server and default endpoint support (P3) (3dadf45)
fix: address final review findings and update AGENTS.md (6a92499)
feat: register telemetry sysconfig keys and add to upgrade/init guide (739da3a)
feat: add remote telemetry reporter and admin telemetry tab (P2) (8a2450d)
feat(server): add environment snapshot and runtime metrics to telemetry (P1) (a3e7de6)
feat(server): add anonymous error telemetry collector (P0) (04c0378)