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

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

services/api/src/albums/assets.service.ts

@@ -29,8 +29,10 @@
 //     presign 为 SigV4 本地计算，无网络副作用。
 import { Inject, Injectable } from '@nestjs/common';
 import type { components } from '@photo/contracts';
+import type { Prisma } from '@photo/db-cn';
 import type { StoragePort } from '@photo/storage';
 import type { AuthUser } from '../auth/session.guard';
+import { buildAssetUpdatedPayload } from '../sync/payloads';
 import { STORAGE_PORT } from '../uploads/storage.provider';
 import {
   assetsObjectKey,
@@ -164,13 +166,28 @@ export class AssetsService {
         );
       }
 
-      // ② 事务：条件更新抢占（并发 complete 恰一人胜出）+ 胜者独占 audit。
+      // ② 事务：条件更新抢占（并发 complete 恰一人胜出，state pending→effective
+      //    迁移同时自增 entityVersion 并写 outbox asset.updated——P2 Task 3 起仅
+      //    生效迁移产生事件，幂等重复 complete 不再发）+ 胜者独占 audit。
       await this.prisma.$transaction(async (tx) => {
         const race = await tx.album_assets.updateMany({
           where: { id: asset.id, state: 'pending' },
-          data: { state: 'effective' },
+          data: { state: 'effective', entityVersion: { increment: 1 } },
         });
         if (race.count === 1) {
+          const effective = await tx.album_assets.findUniqueOrThrow({
+            where: { id: asset.id },
+          });
+          await tx.outbox_events.create({
+            data: {
+              type: 'asset.updated',
+              albumId,
+              entityVersion: effective.entityVersion,
+              payload: buildAssetUpdatedPayload(
+                effective,
+              ) as unknown as Prisma.InputJsonValue,
+            },
+          });
           await tx.audit_logs.create({
             data: {
               actorId: user.id,