feat(booking): add service eligibility based on age and patch tests

- Add eligibility filtering to /api/services: exclude services below
  user's
  age, gray out services requiring patch tests that are missing/expired
- Add new endpoint /api/services/eligible-for/{user_id} for admin
  booking
  flows to check eligibility for a specific user
- Add image metadata stripping: uploads now strip all EXIF/GPS data
  via imaging library (security improvement)
- Update ServiceCard frontend: show grayed-out state for ineligible
  services with "contact us" link (public) or just warning (admin)
- Add 2 patch test services to seed data: Gel Polish Full Set,
  Luxury Gel Manicure (48h each)
- Remove deprecated local-dev.sh script

local-dev-2.sh

@@ -238,6 +238,8 @@ SERVICES=(
   '{"name":"Express Mani & Pedi","description":"Quick file, shape, and polish for both hands and feet.","price":40.00,"duration_minutes":60,"patch_test_duration_hours":0,"minimum_age_required":0}'
   '{"name":"Gel Polish Removal","description":"Safe removal of existing gel polish.","price":10.00,"duration_minutes":20,"patch_test_duration_hours":0,"minimum_age_required":0}'
   '{"name":"Nail Art Add-on","description":"Custom nail art, per two fingers.","price":5.00,"duration_minutes":15,"patch_test_duration_hours":0,"minimum_age_required":0}'
+  '{"name":"Gel Polish Full Set","description":"Full gel polish application - requires patch test 48h before.","price":45.00,"duration_minutes":60,"patch_test_duration_hours":48,"minimum_age_required":0}'
+  '{"name":"Luxury Gel Manicure","description":"Premium gel polish with extended massage - requires patch test 48h before.","price":55.00,"duration_minutes":75,"patch_test_duration_hours":48,"minimum_age_required":0}'
 )
 
 SERVICE_IDS=()