fix: correct billing feature-store API paths and loyalty config

Fix feature-store.js calling /store/features/available instead of
/store/billing/features/available (missing module prefix caused 404).
Also handle platform-prefixed URLs in getStoreCode().

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

app/modules/billing/static/shared/js/feature-store.js

@@ -88,7 +88,7 @@
                 this.error = null;
 
                 // Fetch available features (lightweight endpoint)
-                const response = await apiClient.get('/store/features/available');
+                const response = await apiClient.get('/store/billing/features/available');
 
                 this.features = response.features || [];
                 this.tierCode = response.tier_code;
@@ -116,7 +116,7 @@
             if (!storeCode) return;
 
             try {
-                const response = await apiClient.get('/store/features');
+                const response = await apiClient.get('/store/billing/features');
 
                 // Build map for quick lookup
                 this.featuresMap = {};
@@ -184,9 +184,15 @@
         getStoreCode() {
             const path = window.location.pathname;
             const segments = path.split('/').filter(Boolean);
+            // Direct: /store/{code}/...
             if (segments[0] === 'store' && segments[1]) {
                 return segments[1];
             }
+            // Platform-prefixed: /platforms/{platform}/store/{code}/...
+            const storeIdx = segments.indexOf('store');
+            if (storeIdx !== -1 && segments[storeIdx + 1]) {
+                return segments[storeIdx + 1];
+            }
             return null;
         },
 

app/modules/loyalty/config.py

@@ -43,7 +43,7 @@ class ModuleConfig(BaseSettings):
     # QR code settings
     qr_code_size: int = 300  # pixels
 
-    model_config = {"env_prefix": "LOYALTY_"}
+    model_config = {"env_prefix": "LOYALTY_", "env_file": ".env", "extra": "ignore"}
 
 
 # Export for auto-discovery