新增 affiliate_dash 回调路由与幂等去重(阶段 5)

- POST /api/v1/open/affiliate-dash:验签 → 查任务(404 重试) → webhook_events 幂等闸门 → 状态同步
- migration 013:webhook_events(provider+event_id 唯一)
- task-repo findAffiliateDashTaskByOrder(仿 feifei 同构 SQL)
- notify-service:去重闸门在找到任务之后,任务未匹配不被 eventId 永久拦截
- typecheck + 212 测试通过;前置错误分支脚本验证通过

apps/backend/src/app.ts

@@ -3,6 +3,7 @@ import express from 'express'
 import process from 'node:process'
 
 import adminRouter from './routes/admin.js'
+import affiliateDashRouter from './routes/affiliate-dash.js'
 import collectRouter from './routes/collect.js'
 import filesRouter from './routes/files.js'
 import claimsRouter from './routes/claims.js'
@@ -93,6 +94,7 @@ export function createApp({ startupState, isShutdownStarted, config }: CreateApp
     })
   })
 
+  app.use('/api/v1/open/affiliate-dash', affiliateDashRouter)
   app.use('/api/v1/open/91', open91Router)
   app.use('/api/v1/open/kuaishou-industry', kuaishouIndustryRouter)
   app.use('/api/v1/open/kuaishou-feifei', kuaishouFeifeiRouter)