refactor(fulfillment): 移除飞飞/乐玩通道，仅保留 affiliate_dash

新单只路由 affiliate_dash（未命中走 manual_dispatch）；历史飞飞/乐玩任务保留只读 stub，避免订单重同步失败。同步清理 cloudtentacles 调度、Admin 写路径与相关 env。

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/backend/src/app.ts

@@ -7,7 +7,6 @@ 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'
-import kuaishouFeifeiRouter from './routes/kuaishou-feifei.js'
 import kuaishouIndustryRouter from './routes/kuaishou-industry.js'
 import open91Router from './routes/open-91.js'
 import pddExtensionRouter from './routes/pdd-extension.js'
@@ -103,7 +102,6 @@ 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)
   app.use('/api/v1/claim', claimsRouter)
   app.use('/api/v1/collect', collectRouter)
   app.use('/api/v1/pdd/extension', pddExtensionRouter)