fix(spp_mis_demo_v2): use ORM Shapely geometry for coordinate generation

The _generate_coordinates method tried to read area.geo_polygon.data
and pass it through wkbloads(), but the spp_gis ORM field already
returns a Shapely geometry object which has no .data attribute. This
caused a silent AttributeError for every area, resulting in zero
coordinates generated for any registrant.

Use the Shapely geometry directly instead of trying to re-parse it.

Author: jeremi

spp_mis_demo_v2/models/mis_demo_generator.py

@@ -3811,7 +3811,6 @@ def _generate_coordinates(self, stats):
 
         try:
             from shapely.geometry import shape
-            from shapely.wkb import loads as wkbloads
         except ImportError:
             _logger.warning("[spp.mis.demo] shapely not available, skipping coordinate generation")
             stats["coordinates_generated"] = 0
@@ -3854,8 +3853,8 @@ def _generate_coordinates(self, stats):
                 continue
 
             try:
-                # Convert WKB to shapely polygon
-                polygon = wkbloads(bytes(area.geo_polygon.data))
+                # The ORM returns geo_polygon as a Shapely geometry object
+                polygon = area.geo_polygon
 
                 # Generate random points for all registrants in this area
                 minx, miny, maxx, maxy = polygon.bounds