fix: update vendor templates to use simplified pagination macro

The pagination macro was updated to use a simplified API that only
accepts show_condition. Updated 4 vendor templates:
- products.html
- orders.html
- inventory.html
- customers.html

The macro now relies on standardized Alpine.js component properties
(pagination.page, totalPages, pageNumbers, etc.) instead of passing
them as macro arguments.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

app/templates/vendor/orders.html

@@ -262,19 +262,7 @@
 </div>
 
 <!-- Pagination -->
-<div x-show="!loading && pagination.total > 0" class="mb-8">
-    {{ pagination(
-        current_page='pagination.page',
-        total_pages='totalPages',
-        total_items='pagination.total',
-        start_index='startIndex',
-        end_index='endIndex',
-        page_numbers='pageNumbers',
-        previous_fn='previousPage()',
-        next_fn='nextPage()',
-        goto_fn='goToPage'
-    ) }}
-</div>
+{{ pagination(show_condition="!loading && pagination.total > 0") }}
 
 <!-- Status Update Modal -->
 {{ modal_simple(