Replace '/rails/active_storage/direct_uploads' with GoChat endpoint
'/api/v1/widget/direct_uploads' in two dashboard upload components:
- ActionButtons.vue (new conversation attachment upload)
- ReplyBottomPanel.vue (conversation reply attachment upload)
These data attributes are consumed by vue-upload-component; the actual
upload logic in useFileUpload/fileUploadMixin already used the correct
GoChat endpoints. Spotted by decoupling audit report.