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/storefront/js/loyalty-enroll.js

@@ -3,7 +3,7 @@
 
 function customerLoyaltyEnroll() {
     return {
-        ...data(),
+        ...shopLayoutData(),
 
         // Program info
         program: null,
@@ -62,7 +62,7 @@ function customerLoyaltyEnroll() {
 
             try {
                 const response = await apiClient.post('/storefront/loyalty/enroll', {
-                    customer_email: this.form.email,
+                    email: this.form.email,
                     customer_name: [this.form.first_name, this.form.last_name].filter(Boolean).join(' '),
                     customer_phone: this.form.phone || null,
                     customer_birthday: this.form.birthday || null,
@@ -71,12 +71,13 @@ function customerLoyaltyEnroll() {
                 });
 
                 if (response) {
-                    console.log('Enrollment successful:', response.card_number);
+                    const cardNumber = response.card?.card_number || response.card_number;
+                    console.log('Enrollment successful:', cardNumber);
                     // Redirect to success page - extract base path from current URL
                     // Current page is at /storefront/loyalty/join, redirect to /storefront/loyalty/join/success
                     const currentPath = window.location.pathname;
                     const successUrl = currentPath.replace(/\/join\/?$/, '/join/success') +
-                        '?card=' + encodeURIComponent(response.card_number);
+                        '?card=' + encodeURIComponent(cardNumber);
                     window.location.href = successUrl;
                 }
             } catch (error) {