feat: loyalty feature provider, admin data fixes, storefront mobile menu

- Add LoyaltyFeatureProvider with 11 BINARY/MERCHANT features for billing
  feature gating, wired into loyalty module definition
- Fix subscription-tiers admin page showing 0 features by populating
  feature_codes from tier relationship in all admin tier endpoints
- Fix merchants admin page showing 0 stores and N/A owner by adding
  store_count and owner_email to MerchantResponse and eager-loading owner
- Add "no tiers" warning with link in subscription creation modal when
  platform has no configured tiers
- Add missing mobile menu panel to storefront base template so hamburger
  toggle actually shows navigation links

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

app/modules/tenancy/routes/api/admin_merchants.py

@@ -109,6 +109,7 @@ def get_all_merchants(
                 name=c.name,
                 description=c.description,
                 owner_user_id=c.owner_user_id,
+                owner_email=c.owner.email if c.owner else None,
                 contact_email=c.contact_email,
                 contact_phone=c.contact_phone,
                 website=c.website,
@@ -118,6 +119,7 @@ def get_all_merchants(
                 is_verified=c.is_verified,
                 created_at=c.created_at.isoformat(),
                 updated_at=c.updated_at.isoformat(),
+                store_count=c.store_count,
             )
             for c in merchants
         ],

app/modules/tenancy/schemas/merchant.py

@@ -90,6 +90,7 @@ class MerchantResponse(BaseModel):
 
     # Owner information
     owner_user_id: int
+    owner_email: str | None = Field(None, description="Owner's email address")
 
     # Contact Information
     contact_email: str
@@ -108,6 +109,9 @@ class MerchantResponse(BaseModel):
     created_at: str
     updated_at: str
 
+    # Store statistics
+    store_count: int = Field(0, description="Number of stores under this merchant")
+
 
 class MerchantDetailResponse(MerchantResponse):
     """
@@ -117,11 +121,9 @@ class MerchantDetailResponse(MerchantResponse):
     """
 
     # Owner details (from related User)
-    owner_email: str | None = Field(None, description="Owner's email address")
     owner_username: str | None = Field(None, description="Owner's username")
 
     # Store statistics
-    store_count: int = Field(0, description="Number of stores under this merchant")
     active_store_count: int = Field(
         0, description="Number of active stores under this merchant"
     )

app/modules/tenancy/services/merchant_service.py

@@ -148,7 +148,10 @@ class MerchantService:
         Returns:
             Tuple of (merchants list, total count)
         """
-        query = select(Merchant).options(joinedload(Merchant.stores))
+        query = select(Merchant).options(
+            joinedload(Merchant.stores),
+            joinedload(Merchant.owner),
+        )
 
         # Apply filters
         if search:

app/modules/tenancy/templates/tenancy/admin/merchant-detail.html

@@ -331,12 +331,20 @@
             <!-- Tier Selector -->
             <div class="mb-4">
                 <label class="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-1">Subscription Tier</label>
-                <select x-model="createForm.tier_code"
-                        class="w-full px-3 py-2 text-sm border border-gray-300 rounded-lg dark:border-gray-600 dark:bg-gray-700 dark:text-gray-300 focus:outline-none focus:ring-2 focus:ring-purple-500">
-                    <template x-for="tier in tiers" :key="tier.code">
-                        <option :value="tier.code" x-text="tier.name + ' — ' + formatTierPrice(tier)"></option>
-                    </template>
-                </select>
+                <template x-if="tiers.length > 0">
+                    <select x-model="createForm.tier_code"
+                            class="w-full px-3 py-2 text-sm border border-gray-300 rounded-lg dark:border-gray-600 dark:bg-gray-700 dark:text-gray-300 focus:outline-none focus:ring-2 focus:ring-purple-500">
+                        <template x-for="tier in tiers" :key="tier.code">
+                            <option :value="tier.code" x-text="tier.name + ' — ' + formatTierPrice(tier)"></option>
+                        </template>
+                    </select>
+                </template>
+                <template x-if="tiers.length === 0">
+                    <div class="p-3 text-sm text-amber-700 bg-amber-50 border border-amber-200 rounded-lg dark:text-amber-300 dark:bg-amber-900/20 dark:border-amber-800">
+                        No tiers configured for this platform.
+                        <a href="/admin/subscription-tiers" class="underline font-medium hover:text-amber-900 dark:hover:text-amber-100">Create a tier first</a>.
+                    </div>
+                </template>
             </div>
 
             <!-- Status -->
@@ -372,7 +380,7 @@
                     Cancel
                 </button>
                 <button @click="createSubscription()"
-                        :disabled="creatingSubscription"
+                        :disabled="creatingSubscription || tiers.length === 0"
                         class="px-4 py-2 text-sm font-medium text-white bg-purple-600 rounded-lg hover:bg-purple-700 disabled:opacity-50 disabled:cursor-not-allowed">
                     <span x-show="!creatingSubscription">Create</span>
                     <span x-show="creatingSubscription">Creating...</span>