fix: resolve architecture validation errors in media and customers APIs

- Add proper media exceptions (MediaNotFoundException, MediaUploadException, etc.)
- Update media service to use exceptions from app/exceptions/media
- Remove direct HTTPException raises from vendor/media.py and vendor/customers.py
- Move db.query from customers API to service layer (get_customer_orders)
- Fix pagination macro call in vendor/media.html template
- Update media.js: add parent init call, PlatformSettings, apiClient.postFormData
- Add try/catch error handling to media.js init method

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

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

app/templates/vendor/media.html

@@ -199,7 +199,7 @@
 
     <!-- Pagination -->
     <div x-show="pagination.pages > 1" class="mt-6">
-        {{ pagination('pagination', 'loadMedia') }}
+        {{ pagination('pagination.pages > 1') }}
     </div>
 </div>