Implement missing backend endpoints for release orchestration
TASK-002: 11 deployment monitoring endpoints in JobEngine
(list, get, logs, events, metrics, pause/resume/cancel/rollback/retry)
TASK-003: 6 evidence management endpoints in JobEngine
(list, get, verify, export, raw, timeline)
TASK-005: 3 release dashboard endpoints in JobEngine
(dashboard summary, approve/reject promotion)
TASK-006: 2 registry image search endpoints in Scanner
(search with 9 mock images, digests lookup)
All endpoints return seed/mock data for testing. Auth policies
match existing patterns. Dual route registration on both
/api/ and /api/v1/ prefixes.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>