Initial commit MKD fixes

backend/migrations/add_pr_events_location_place.sql

@@ -0,0 +1,8 @@
+-- Место проведения для мероприятий "для жителей": участок или дома отдельно
+ALTER TABLE pr_events ADD COLUMN IF NOT EXISTS location_place_type VARCHAR(20) CHECK (location_place_type IN ('district', 'buildings'));
+ALTER TABLE pr_events ADD COLUMN IF NOT EXISTS location_district_id VARCHAR(50) REFERENCES districts(id) ON DELETE SET NULL;
+ALTER TABLE pr_events ADD COLUMN IF NOT EXISTS location_building_ids JSONB DEFAULT '[]';
+
+COMMENT ON COLUMN pr_events.location_place_type IS 'Для жителей: district = участок, buildings = дома отдельно';
+COMMENT ON COLUMN pr_events.location_district_id IS 'ID участка, если location_place_type = district';
+COMMENT ON COLUMN pr_events.location_building_ids IS 'Массив ID домов, если location_place_type = buildings';