feat(tradein): city sweep — auto ЕКБ pipeline (anchors × pages + enrichment + cancel)
- avito.py: fetch_around(pages=N, delay_override_sec) — pagination 1..N (backward compat default=1)
- scrape_pipeline.py:
* EKB_ANCHORS const (5 точек ЕКБ)
* run_avito_pipeline: pages + request_delay_sec params (backward compat defaults)
* CitySweepCounters dataclass с anchors_done/total + aggregate counters
* run_avito_city_sweep(db, run_id, *, pages_per_anchor, detail_top_n, request_delay_sec)
* Cooperative cancel: checks scrape_runs.status каждый anchor
* Per-anchor heartbeat + counters refresh
- scrape_runs.py NEW: utility module (create_run/update_heartbeat/mark_done/failed/cancelled/list_recent/is_cancelled)
- admin.py: 3 NEW endpoints:
* POST /admin/scrape/avito-city-sweep — start (returns run_id, FastAPI BackgroundTasks)
* GET /admin/scrape/avito-city-sweep/runs?limit=N — recent runs list
* POST /admin/scrape/avito-city-sweep/{run_id}/cancel — cooperative cancel
- 051_scrape_runs_extend.sql: ADD COLUMN params/counters/error/finished_at + cancelled в status enum
- avito-city-sweep.sh: cron wrapper с random 0-3h delay (anti-pattern-detection)
- tests/test_city_sweep.py: 16 offline smoke tests (counters, scrape_runs utils, endpoints)
Crontab entry: 0 2 * * * /opt/.../avito-city-sweep.sh (runs 02:00-05:00 UTC daily)
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