fix(analyze): 500 on parcels with NULL geometry (random-parcel crash)

POST /analyze 500'd (TypeError: float(None)) for ~964 cad_parcels_geom rows
that have a meta row but geom IS NULL: the resolution query returned the row
(no NULL filter), geom_wkt became NULL → ST_Centroid(NULL) → NULL lat/lon →
float(centroid_row["lat"]) crashed (the `if centroid_row else` guard checked
row existence, not NULL values). A user entering any such "random parcel" hit
a 500.

Fix:
- Add `AND geom IS NOT NULL` to all three geometry-resolution queries (initial
  UNION, inline-refetch UNION, geom_row WKT subquery) so a NULL-geometry parcel
  is treated as "no usable geometry" → falls into the #93 graceful fallback
  (enqueue NSPD on-demand fetch → 202 polling), exactly like a parcel absent
  from the DB. The fetch then populates real geometry and analyze succeeds.
- Defensive: centroid_lat/lon now check the VALUE is not None (not just row
  existence) before float(), falling back to EKB center.

Verified: badformat→400, not-in-DB→202(fetching), valid parcel→200 unaffected.
39 analyze/by-bbox tests green. Refs #944.

backend/app/api/v1/parcels.py

@@ -1214,19 +1214,19 @@ def analyze_parcel(
                    g.geom              AS geom_wkb,
                    'cad_quarter'       AS source
               FROM cad_quarters_geom g
-             WHERE g.cad_number = :c
+             WHERE g.cad_number = :c AND g.geom IS NOT NULL
             UNION ALL
             SELECT ST_AsGeoJSON(b.geom) AS geom_geojson,
                    b.geom               AS geom_wkb,
                    'cad_building'       AS source
               FROM cad_buildings b
-             WHERE b.cad_num = :c
+             WHERE b.cad_num = :c AND b.geom IS NOT NULL
             UNION ALL
             SELECT ST_AsGeoJSON(p.geom) AS geom_geojson,
                    p.geom               AS geom_wkb,
                    'cad_parcel'         AS source
               FROM cad_parcels_geom p
-             WHERE p.cad_num = :c
+             WHERE p.cad_num = :c AND p.geom IS NOT NULL
              LIMIT 1
         """),
             {"c": cad_num},
@@ -1235,6 +1235,10 @@ def analyze_parcel(
         .first()
     )
 
+    # NB: geom IS NOT NULL во всех ветках — участок с meta-строкой, но NULL-geometry
+    # (964 таких в cad_parcels_geom) НЕ должен «найтись» с пустой геометрией (иначе
+    # ST_Centroid→NULL→float(None)→500). Без geom он попадает в #93 graceful fallback
+    # ниже (enqueue NSPD fetch → 202), как и участок, которого нет в БД вовсе.
     if not row:
         # #93 — graceful fallback: enqueue NSPD fetch, await inline до 15s
         # (см. _INLINE_FETCH_WAIT_S — снижено с 25 для threadpool safety).
@@ -1260,15 +1264,15 @@ def analyze_parcel(
                                g.geom              AS geom_wkb,
                                'cad_quarter'       AS source
                           FROM cad_quarters_geom g
-                         WHERE g.cad_number = :c
+                         WHERE g.cad_number = :c AND g.geom IS NOT NULL
                         UNION ALL
                         SELECT ST_AsGeoJSON(b.geom), b.geom, 'cad_building'
                           FROM cad_buildings b
-                         WHERE b.cad_num = :c
+                         WHERE b.cad_num = :c AND b.geom IS NOT NULL
                         UNION ALL
                         SELECT ST_AsGeoJSON(p.geom), p.geom, 'cad_parcel'
                           FROM cad_parcels_geom p
-                         WHERE p.cad_num = :c
+                         WHERE p.cad_num = :c AND p.geom IS NOT NULL
                          LIMIT 1
                         """),
                         {"c": cad_num},
@@ -1299,11 +1303,14 @@ def analyze_parcel(
             text("""
             SELECT ST_AsText(g.geom) AS wkt
               FROM (
-                SELECT g.geom FROM cad_quarters_geom g WHERE g.cad_number = :c
+                SELECT g.geom FROM cad_quarters_geom g
+                 WHERE g.cad_number = :c AND g.geom IS NOT NULL
                 UNION ALL
-                SELECT b.geom FROM cad_buildings b WHERE b.cad_num = :c
+                SELECT b.geom FROM cad_buildings b
+                 WHERE b.cad_num = :c AND b.geom IS NOT NULL
                 UNION ALL
-                SELECT p.geom FROM cad_parcels_geom p WHERE p.cad_num = :c
+                SELECT p.geom FROM cad_parcels_geom p
+                 WHERE p.cad_num = :c AND p.geom IS NOT NULL
               ) g
              LIMIT 1
         """),
@@ -1586,8 +1593,15 @@ def analyze_parcel(
         .mappings()
         .first()
     )
-    centroid_lat: float = float(centroid_row["lat"]) if centroid_row else 56.838
-    centroid_lon: float = float(centroid_row["lon"]) if centroid_row else 60.605
+    # Defensive: centroid_row может существовать, но с NULL lat/lon (вырожденная/
+    # невалидная геометрия → ST_Centroid NULL). Проверяем именно значения, а не только
+    # наличие строки — иначе float(None) → 500. Fallback = центр ЕКБ.
+    centroid_lat: float = (
+        float(centroid_row["lat"]) if centroid_row and centroid_row["lat"] is not None else 56.838
+    )
+    centroid_lon: float = (
+        float(centroid_row["lon"]) if centroid_row and centroid_row["lon"] is not None else 60.605
+    )
 
     # 6b) Distance to EKB center + center bonus
     dist_to_center_km = _haversine_km(centroid_lat, centroid_lon, EKB_CENTER_LAT, EKB_CENTER_LON)