Refactor profile screen and organize project structure

- Extract ProfileScreen and components to features/profile
- Move shared hooks and stores to top-level
- Add RLS policies for admin permissions
- Add RELEASING.md guide
- Update .gitignore

apps/supabase/migrations/20260101114500_add_redemption_codes_permission_rls.sql

@@ -0,0 +1,17 @@
+-- Add RLS policies for redemption codes
+
+CREATE POLICY "Admins with manage_codes permission can view redemption codes"
+  ON redemption_codes FOR SELECT
+  USING (has_permission('manage_codes'));
+
+CREATE POLICY "Admins with manage_codes permission can insert redemption codes"
+  ON redemption_codes FOR INSERT
+  WITH CHECK (has_permission('manage_codes'));
+
+CREATE POLICY "Admins with manage_codes permission can update redemption codes"
+  ON redemption_codes FOR UPDATE
+  USING (has_permission('manage_codes'));
+
+CREATE POLICY "Admins with manage_codes permission can delete redemption codes"
+  ON redemption_codes FOR DELETE
+  USING (has_permission('manage_codes'));