Webshop B1: Anfrage-Dienst, Kundenroute /api/shop und Team-Mail T21

Anfrage stellen, zurückziehen und Stand lesen (ensureShopConfig, normalisiereAnfrage,
stelleAnfrage, zieheZurueck, anfrageAnsicht), Router /api/shop mit Rate-Limit 20/h und
Sperre in der Kundenansicht, Vorlage T21 Neue Webshop-Anfrage mit Tests.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

server/index.js

@@ -17,6 +17,7 @@ import chatRoutes from './routes/chat.js'
 import aboRoutes from './routes/abo.js'
 import funktionenRoutes from './routes/funktionen.js'
 import termineRoutes from './routes/termine.js'
+import shopRoutes from './routes/shop.js'
 import takeoverCreditRoutes from './routes/takeoverCredits.js'
 import { purgeExpiredUploads } from './services/takeoverCredits.js'
 import { purgePendingChatUploads } from './services/chatAttachments.js'
@@ -79,6 +80,7 @@ app.use('/api/abo/takeover-credits', takeoverCreditRoutes)
 app.use('/api/abo', aboRoutes)
 app.use('/api/funktionen', funktionenRoutes)
 app.use('/api/termine', termineRoutes)
+app.use('/api/shop', shopRoutes)
 app.use('/api/team', teamRoutes)
 app.use('/api/admin/gitea', adminGiteaRoutes)
 app.use('/api/admin/website-projects', adminPreviewRoutes)