Fix park submission locations

Implement Phase 1 of the JSONB violation fix by creating the `park_submission_locations` table. This includes migrating existing data from `park_submissions.temp_location_data` and updating relevant code to read and write to the new relational table. The `temp_location_data` column will be dropped after data migration.

src/types/submission-data.ts

@@ -6,6 +6,7 @@
 import type { LocationData } from './location';
 
 export interface ParkSubmissionData {
+  id?: string; // park_submission.id for location lookup
   name: string;
   slug: string;
   description?: string | null;