Adds the recipe_jobs table and background task pipeline for level 3/4
recipe generation. POST ?async=true returns 202 with job_id; clients
poll GET /recipes/jobs/{job_id} until status=done.
Key fix: _enqueue_recipe_job now calls scheduler.enqueue() after
insert_task() to wake the in-memory work queue immediately. Without
this, tasks sat in 'queued' until the scheduler's 30s idle cycle or
an API restart triggered _load_queued_tasks().
- Migration 034: recipe_jobs table (job_id, user_id, status, request,
result, error) with indexes on job_id and user_id/created_at
- Store: create/get/update_running/complete/fail recipe job methods
- runner.py: recipe_llm task type + _run_recipe_llm handler; MUST
call fail_recipe_job() before re-raising so status stays consistent
- CLOUD_MODE guard: falls back to sync generation (scheduler only
polls shared settings DB, not per-user DBs)
- L4 wildcard is covered by the same req.level in (3, 4) dispatch
pyr0ball
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