fix(admin): pagination, patch tests, and per-page limits

Backend:
- Fix GetAllAdminBookingsHandler and SearchAdminBookingsHandler to
  return totalPages in response
- Auto-record patch tests when booking status progresses to "completed"
- Add GET/POST /api/admin/users/{id}/patch-tests endpoints
  Frontend:
- BookingsCard: proper pagination with 4 per page, prev/next buttons
- UsersCard, BookingCreateModal, WalkInCreateModal: per_page=4 for user
  search
- Add PatchTestModal for manual patch test entry in UserModal
- Hide patch test section when user has no eligible services
  Database:
- Add UNIQUE constraint on user_service_patch_tests(user_id, service_id)

init-scripts/init-script.sql

@@ -152,7 +152,8 @@ CREATE TABLE user_service_patch_tests (
     id BIGSERIAL PRIMARY KEY,
     user_id CHAR(12) NOT NULL REFERENCES users(id) ON DELETE CASCADE,
     service_id CHAR(12) NOT NULL REFERENCES services(id) ON DELETE CASCADE,
-    last_time TIMESTAMPTZ NOT NULL
+    last_time TIMESTAMPTZ NOT NULL,
+    UNIQUE (user_id, service_id)
 );
 
 CREATE INDEX idx_service_patch_tests_userid ON user_service_patch_tests(user_id);