feat(storefront): homepage, module gating, widget protocol, i18n fixes

Storefront homepage & module gating:
- CMS owns storefront GET / (slug="home" with 3-tier resolution)
- Catalog loses GET / (keeps /products only)
- Store root redirect (GET / → /store/dashboard or /store/login)
- Route gating: non-core modules return 404 when disabled for platform
- Seed store default homepages per platform

Widget protocol for customer dashboard:
- StorefrontDashboardCard contract in widgets.py
- Widget aggregator get_storefront_dashboard_cards()
- Orders and Loyalty module widget providers
- Dashboard template renders contributed cards (no module names)

Landing template module-agnostic:
- CTAs driven by storefront_nav (not hardcoded module names)
- Header actions check nav item IDs (not enabled_modules)
- Remove hardcoded "Add Product" sidebar button
- Remove all enabled_modules checks from storefront templates

i18n fixes:
- Title placeholder resolution ({{store_name}}) for store default pages
- Storefront nav label_keys prefixed with module code
- Add storefront.account.* keys to 6 modules (en/fr/de/lb)
- Header/footer CMS pages use get_translated_title(current_language)
- Footer labels use i18n keys instead of hardcoded English

Icon cleanup:
- Standardize on map-pin (remove location-marker alias)
- Replace all location-marker references across templates and docs

Docs:
- Storefront builder vision proposal (6 phases)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/modules/catalog/definition.py

@@ -134,7 +134,7 @@ catalog_module = ModuleDefinition(
                 items=[
                     MenuItemDefinition(
                         id="products",
-                        label_key="storefront.nav.products",
+                        label_key="catalog.storefront.nav.products",
                         icon="shopping-bag",
                         route="products",
                         order=10,
@@ -148,7 +148,7 @@ catalog_module = ModuleDefinition(
                 items=[
                     MenuItemDefinition(
                         id="search",
-                        label_key="storefront.actions.search",
+                        label_key="catalog.storefront.actions.search",
                         icon="search",
                         route="",
                         order=10,

app/modules/catalog/locales/de.json

@@ -89,5 +89,13 @@
         "products_import_desc": "Massenimport von Produkten",
         "products_export": "Produkte exportieren",
         "products_export_desc": "Produktdaten exportieren"
+    },
+    "storefront": {
+        "nav": {
+            "products": "Produkte"
+        },
+        "actions": {
+            "search": "Suchen"
+        }
     }
 }

app/modules/catalog/locales/en.json

@@ -107,5 +107,13 @@
     "menu": {
         "products_inventory": "Products & Inventory",
         "all_products": "All Products"
+    },
+    "storefront": {
+        "nav": {
+            "products": "Products"
+        },
+        "actions": {
+            "search": "Search"
+        }
     }
 }

app/modules/catalog/locales/fr.json

@@ -89,5 +89,13 @@
         "products_import_desc": "Importation en masse de produits",
         "products_export": "Exporter les produits",
         "products_export_desc": "Exporter les données produits"
+    },
+    "storefront": {
+        "nav": {
+            "products": "Produits"
+        },
+        "actions": {
+            "search": "Rechercher"
+        }
     }
 }

app/modules/catalog/locales/lb.json

@@ -89,5 +89,13 @@
         "products_import_desc": "Massenimport vu Produiten",
         "products_export": "Produiten exportéieren",
         "products_export_desc": "Produitdaten exportéieren"
+    },
+    "storefront": {
+        "nav": {
+            "products": "Produkter"
+        },
+        "actions": {
+            "search": "Sichen"
+        }
     }
 }

app/modules/catalog/routes/pages/storefront.py

@@ -30,11 +30,10 @@ router = APIRouter()
 # ============================================================================
 
 
-@router.get("/", response_class=HTMLResponse, include_in_schema=False)
 @router.get("/products", response_class=HTMLResponse, include_in_schema=False)
 async def shop_products_page(request: Request, db: Session = Depends(get_db)):
     """
-    Render shop homepage / product catalog.
+    Render product catalog listing.
     Shows featured products and categories.
     """
     logger.debug(