Group B of the scraper_kit migration epic (#2277): switch the three files'
internal dependency imports from legacy app/services/scrapers/* to their
byte/structurally-identical scraper_kit equivalents, proven via the new
parity harness (tests/support/parity.assert_parity, #2304). Public API of
all three files is unchanged, so no callers needed updating.
- cian_price_history.py: fetch_detail/save_detail_enrichment now from
scraper_kit.providers.cian.detail. Wires config=RealScraperConfig() at
the call site — kit's fetch_detail only reads cian_proxy_url when an
explicit config is passed, unlike legacy's always-on settings read;
without this the admin-triggered backfill would silently drop its
datacenter-IP proxy (#806) after the import swap.
- cian_session.py: extract_state now from scraper_kit.cian_state_parser
(byte-identical to legacy).
- yandex_price_history.py: ScrapedLot now from scraper_kit.base
(byte-identical fields/methods; record_yandex_price_history only reads
lot.* via duck-typing, no isinstance checks).
New tests/test_scraper_kit_pricehistory_session_parity.py proves the
migration delta specifically (extract_state, ScrapedLot.model_dump(),
fetch_detail+DetailEnrichment with config injection, and the own-session
proxy-kwarg wiring). Full backend suite passes (3145 passed, 6 skipped,
1 pre-existing unrelated failure confirmed on unmodified forgejo/main).
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