Refactor park submission location handling

supabase/migrations/20251105204521_9d709e71-6555-40b1-acf5-b1b34c0c44ed.sql

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+-- Add temporary location storage to park_submissions
+-- This stores location data until approval, when it will be created in locations table
+
+ALTER TABLE park_submissions 
+ADD COLUMN temp_location_data JSONB;
+
+COMMENT ON COLUMN park_submissions.temp_location_data IS 
+'Temporary storage for location data before approval. Contains: name, city, state_province, country, latitude, longitude, timezone, postal_code, display_name';
+
+-- Add index for querying submissions with temp location data
+CREATE INDEX idx_park_submissions_temp_location ON park_submissions (submission_id) 
+WHERE temp_location_data IS NOT NULL;