fix(tradein-phase-c): prepend region prefix to addresses for IMV geocoder

Avito /coords/by_address mis-resolves ambiguous addresses to wrong regions.
Examples: 'улица Академика Королева, 8Г' -> Беларусь, Могилёв (404);
'р-н Орджоникидзевский, мкр. Уралмаш...' -> Хакасия (404).

Add _REGION_BBOX lookup (lat/lon -> region name) + _enrich_address_for_imv()
that prepends region prefix if address doesn't already have one. Default EKB
fallback when coords are NULL.

tradein-mvp/scripts/backfill-house-imv.py

@@ -70,6 +70,46 @@ def _map_house_type(raw: str | None) -> str:
         return _HOUSE_TYPE_DEFAULT
     return _HOUSE_TYPE_TO_IMV.get(raw.lower().strip(), _HOUSE_TYPE_DEFAULT)
 
+
+# Bounding boxes for known regions in our DB.
+# When house.lat/lon falls inside one, we prepend the region name to address
+# before sending to Avito (resolves ambiguity — e.g. "Орджоникидзевский район" exists
+# in EKB AND in Khakasia republic).
+_REGION_BBOX = [
+    # (region_name, lat_min, lat_max, lon_min, lon_max)
+    ("Свердловская область, Екатеринбург", 56.5, 57.1, 59.9, 61.0),
+    ("Свердловская область", 56.0, 61.0, 58.0, 65.0),  # rest of region
+    ("Кировская область, Киров", 58.4, 58.8, 49.4, 49.9),
+    ("Ставропольский край, Ставрополь", 44.9, 45.2, 41.7, 42.2),
+    ("Тюменская область, Тюмень", 57.0, 57.3, 65.3, 65.8),
+    ("Челябинская область, Челябинск", 55.0, 55.4, 61.2, 61.7),
+]
+_REGION_DEFAULT = "Свердловская область, Екатеринбург"  # bulk of our data is EKB
+
+
+def _detect_region_prefix(lat: float | None, lon: float | None) -> str:
+    if lat is None or lon is None:
+        return _REGION_DEFAULT
+    for name, lat_min, lat_max, lon_min, lon_max in _REGION_BBOX:
+        if lat_min <= lat <= lat_max and lon_min <= lon <= lon_max:
+            return name
+    return _REGION_DEFAULT
+
+
+def _enrich_address_for_imv(raw: str, lat: float | None, lon: float | None) -> str:
+    """Prepend region prefix if address lacks one (ambiguity fix for Avito geocoder)."""
+    addr = (raw or "").strip()
+    # Already has region marker? skip
+    addr_lower = addr.lower()
+    if any(
+        m in addr_lower
+        for m in ("область,", " обл.,", " обл,", "край,", "респ.,", "республика,")
+    ):
+        return addr
+    prefix = _detect_region_prefix(lat, lon)
+    return f"{prefix}, {addr}"
+
+
 DATABASE_URL = os.environ.get("DATABASE_URL")
 if not DATABASE_URL:
     raise SystemExit(
@@ -317,8 +357,14 @@ async def process_one(db: Session, house: dict) -> str:
         mark_status(db, house["id"], "no_address", "house.address is NULL")
         return "no_address"
 
+    # Enrich with region prefix to prevent Avito geocoder mis-resolving ambiguous
+    # street names to wrong regions (e.g. "улица Победы" exists in EKB and Khakasia).
+    enriched = _enrich_address_for_imv(address, house.get("lat"), house.get("lon"))
+    if enriched != address:
+        logger.debug("enriched address house=%d %r -> %r", house["id"], address, enriched)
+
     try:
-        result = await evaluate_via_imv(address=address, **params)
+        result = await evaluate_via_imv(address=enriched, **params)
     except IMVAddressNotFoundError as e:
         mark_status(db, house["id"], "not_found", str(e)[:200])
         return "not_found"