feat(sync): cn event coverage, bootstrap and outbox sender

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

packages/contracts/src/__tests__/events.test.ts

@@ -59,13 +59,16 @@ describe('OutboxEvent', () => {
 });
 
 describe('OUTBOX_EVENT_TYPES', () => {
-  it('恰好包含全部 5 个事件类型字符串', () => {
+  it('恰好包含全部 8 个事件类型字符串', () => {
     expect([...OUTBOX_EVENT_TYPES]).toEqual([
       'photo.published',
       'photo.hidden',
       'photo.deleted',
       'photo.likes.updated',
       'album.updated',
+      'category.updated',
+      'category.deleted',
+      'asset.updated',
     ]);
   });