Adds the queue_jobs, queue_jobs_failed, and job_throttles tables and wires
up BoundedQueueWorker (deadline-bounded queue draining, shared by the
JobRunner filter for web/auto mode and the manual "Process Jobs" UI) gated
by JobThrottleGate. Adds retry limit, retention, and auto-purge settings
to the Job Queue settings tab, and a manual per-queue processing UI on the
Utilities tab. Also adds a second-granularity throttle period and
BaseOsposJob as the shared base for core queue jobs.
This is issue #3833 Phase 2 — no real job types are queued yet.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
