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/core/utils/page_context.py

@@ -359,14 +359,12 @@ def get_storefront_context(
         "clean_path": clean_path,
         "access_method": access_method,
         "base_url": base_url,
-        "enabled_modules": set(),
-        "storefront_nav": {},
         "subscription": subscription,
         "subscription_tier": subscription_tier,
         "tier_code": subscription_tier.code if subscription_tier else None,
     }
 
-    # If no db session, return just the base context
+    # If no db session, return just the base context with safe defaults
     if db is None:
         context = _build_base_context(
             request,
@@ -374,10 +372,13 @@ def get_storefront_context(
             getattr(request.state, "language", "en"),
         )
         context.update(storefront_base)
+        context["enabled_modules"] = set()
+        context["storefront_nav"] = {}
         context.update(extra_context)
         return context
 
     # Full context with module contributions
+    # (get_context_for_frontend computes enabled_modules and storefront_nav)
     return get_context_for_frontend(
         FrontendType.STOREFRONT,
         request,