fix: resolve architecture warnings (SVC-006, FE-008, FE-004)

- Move db.commit() from admin_subscription_service to API endpoints
- Add noqa comments for intentional number inputs in templates
- Add noqa comment for inline modal in subscriptions.html

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

app/templates/admin/vendor-product-edit.html

@@ -147,6 +147,7 @@
                 Pricing
             </h3>
             <div class="grid gap-4 md:grid-cols-2 lg:grid-cols-4">
+                {# noqa: FE-008 - Using raw number input for price with EUR prefix #}
                 <div>
                     <label class="block text-sm font-medium text-gray-700 dark:text-gray-400 mb-1">
                         Price (incl. VAT) <span class="text-red-500">*</span>