fix(parcels): rename CTE overlaps → overlap_rows (#1196 regression of #1195)

`OVERLAPS` — это PostgreSQL keyword (binary operator для time-periods —
`(start1,end1) OVERLAPS (start2,end2)`). Парсер ругается на `overlaps AS (...)`
в WITH-блоке с

  ERROR: syntax error at or near "overlaps"

→ exception → транзакция в aborted state → весь analyze пайплайн ниже
получает InFailedSqlTransaction (ird_overlays, persist, ird block) → фронт
видит data_available=False, neighbors=[]. Воспроизводится на КАЖДОМ
/analyze с момента мерджа PR #1195.

Mock-БД в pytest tests/api/v1/ синтаксис не проверяет — отсюда регрессия
прошла CI. Прямой psql-replay на проде:
  WITH neighbors AS (...), overlaps AS (...) → syntax error
  WITH neighbors AS (...), overlap_rows AS (...) → ok

Минимальная переименование CTE alias (4 строки: 2 в SQL + 1 в SELECT
column alias + 1 в Python `row["overlap_rows"]`). Семантика идентична PR #1195.

Memory: future-proofing — добавить интеграционный тест с реальной PG для
analyze hot-path (отдельный issue, не блокер этого hotfix).

Refs #1196

backend/app/api/v1/parcels.py

@@ -620,7 +620,7 @@ def _neighbors_summary(db: Session, geom_wkt: str, our_cad_num: str) -> dict[str
                      ORDER BY distance_m ASC
                      LIMIT 30
                 ),
-                overlaps AS (
+                overlap_rows AS (
                     SELECT cad_num,
                            building_name,
                            floors,
@@ -637,6 +637,8 @@ def _neighbors_summary(db: Session, geom_wkt: str, our_cad_num: str) -> dict[str
                      ORDER BY overlap_m2 DESC NULLS LAST
                      LIMIT 5
                 )
+                -- CTE name `overlap_rows` (НЕ `overlaps`): `OVERLAPS` — PG keyword
+                -- (binary operator для time-periods), парсер ругается на `overlaps AS (`.
                 SELECT
                   COALESCE(
                     (SELECT json_agg(row_to_json(n) ORDER BY n.distance_m ASC)
@@ -645,9 +647,9 @@ def _neighbors_summary(db: Session, geom_wkt: str, our_cad_num: str) -> dict[str
                   ) AS neighbors,
                   COALESCE(
                     (SELECT json_agg(row_to_json(o) ORDER BY o.overlap_m2 DESC NULLS LAST)
-                       FROM overlaps o),
+                       FROM overlap_rows o),
                     '[]'::json
-                  ) AS overlaps
+                  ) AS overlap_rows
             """),
                 {"wkt": geom_wkt, "our_cad": our_cad_num},
             )
@@ -655,7 +657,7 @@ def _neighbors_summary(db: Session, geom_wkt: str, our_cad_num: str) -> dict[str
             .first()
         )
         neighbor_rows: list[dict[str, Any]] = list(row["neighbors"]) if row else []
-        overlap_row: list[dict[str, Any]] = list(row["overlaps"]) if row else []
+        overlap_row: list[dict[str, Any]] = list(row["overlap_rows"]) if row else []
     except Exception as e:
         logger.warning("neighbors query failed: %s", e)
         return {"data_available": False, "note": f"neighbors query failed: {e}"}