Add clone support for scene and automation cards, update sync clock descriptions

- Scene clone: opens capture modal with prefilled name/description/targets
  instead of server-side duplication; removed backend clone endpoint
- Automation clone: opens editor with prefilled conditions, scene, logic,
  deactivation mode (webhook tokens stripped for uniqueness)
- Updated sync clock i18n descriptions to reflect speed-only-on-clock model
- Added entity card clone pattern documentation to server/CLAUDE.md

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/wled_controller/static/js/app.js

@@ -80,7 +80,7 @@ import {
 import {
     loadAutomations, openAutomationEditor, closeAutomationEditorModal,
     saveAutomationEditor, addAutomationCondition,
-    toggleAutomationEnabled, deleteAutomation, copyWebhookUrl,
+    toggleAutomationEnabled, cloneAutomation, deleteAutomation, copyWebhookUrl,
     expandAllAutomationSections, collapseAllAutomationSections,
 } from './features/automations.js';
 import {
@@ -315,6 +315,7 @@ Object.assign(window, {
     saveAutomationEditor,
     addAutomationCondition,
     toggleAutomationEnabled,
+    cloneAutomation,
     deleteAutomation,
     copyWebhookUrl,
     expandAllAutomationSections,