fix: loyalty storefront and store card detail — enrollment, context, and Alpine.js

- Fix storefront enabled_modules always empty (page_context overwrote computed
  set with empty default via extra_context)
- Fix storefront loyalty JS using store's data() instead of shopLayoutData()
- Remove defer from storefront loyalty scripts to prevent Alpine race condition
- Fix enrollment field name mismatch (customer_email → email) in both store
  and storefront JS
- Add self-enrollment customer creation (resolve_customer_id with
  create_if_missing) including hashed_password and customer_number
- Fix card list showing "Unknown" — add customer_name/email to CardResponse
- Add GET /cards/{card_id} detail endpoint for store card detail page
- Fix enroll-success.html using data() instead of shopLayoutData()
- Fix enrollment redirect reading response.card_number instead of
  response.card.card_number

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/modules/loyalty/static/store/js/loyalty-enroll.js

@@ -67,7 +67,7 @@ function storeLoyaltyEnroll() {
                 loyaltyEnrollLog.info('Enrolling customer:', this.form.email);
 
                 const response = await apiClient.post('/store/loyalty/cards/enroll', {
-                    customer_email: this.form.email,
+                    email: this.form.email,
                     customer_phone: this.form.phone || null,
                     customer_name: [this.form.first_name, this.form.last_name].filter(Boolean).join(' '),
                     customer_birthday: this.form.birthday || null,