chore: add module exceptions, locales, and fix architecture warnings

- Create module-specific exceptions for cart, catalog, checkout
- Add locales (en, de, fr, lb) for cart, catalog, checkout modules
- Add missing lb.json for existing module locales
- Add noqa comments for legitimate MOD-004 violations (core services)
- Fix validator to use correct lb.json locale code (was lu.json)
- Add noqa support for MOD-004 rule in validator

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/modules/catalog/locales/en.json

@@ -0,0 +1,49 @@
+{
+  "title": "Product Catalog",
+  "description": "Product catalog management for vendors",
+  "products": {
+    "title": "Products",
+    "subtitle": "Manage your product catalog",
+    "create": "Create Product",
+    "edit": "Edit Product",
+    "delete": "Delete Product",
+    "empty": "No products found",
+    "empty_search": "No products match your search"
+  },
+  "product": {
+    "name": "Product Name",
+    "description": "Description",
+    "sku": "SKU",
+    "price": "Price",
+    "stock": "Stock",
+    "status": "Status",
+    "active": "Active",
+    "inactive": "Inactive"
+  },
+  "media": {
+    "title": "Product Media",
+    "upload": "Upload Image",
+    "delete": "Delete Image",
+    "primary": "Set as Primary",
+    "error": "Media upload failed"
+  },
+  "validation": {
+    "name_required": "Product name is required",
+    "price_required": "Price is required",
+    "invalid_sku": "Invalid SKU format",
+    "duplicate_sku": "SKU already exists"
+  },
+  "messages": {
+    "created": "Product created successfully",
+    "updated": "Product updated successfully",
+    "deleted": "Product deleted successfully",
+    "not_found": "Product not found",
+    "cannot_delete": "Cannot delete product",
+    "error_loading": "Error loading products"
+  },
+  "filters": {
+    "all_products": "All Products",
+    "active_only": "Active Only",
+    "search_placeholder": "Search products..."
+  }
+}