fix: add allowedOrigins for Next.js server actions behind reverse proxy

Next.js has its own CSRF protection for server actions, separate from
Payload's csrf config. Without allowedOrigins, server actions from the
admin panel behind a reverse proxy are rejected because the Origin header
(cms.c2sgmbh.de) doesn't match the Host header (localhost:3001).

Also removes temporary debug logging from multiTenant access check.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

next.config.mjs

@@ -7,6 +7,14 @@ const nextConfig = {
     // Use fewer workers for builds on low-memory systems
     workerThreads: false,
     cpus: 1,
+    // Allow server actions from these origins (behind reverse proxy)
+    serverActions: {
+      allowedOrigins: [
+        'pl.porwoll.tech',
+        'pl.c2sgmbh.de',
+        'cms.c2sgmbh.de',
+      ],
+    },
   },
   // Webpack configuration for TypeScript/ESM compatibility
   webpack: (webpackConfig) => {

src/payload.config.ts

@@ -409,18 +409,7 @@ export default buildConfig({
         } as Record<string, { customTenantField?: boolean }>),
       },
       // Super Admins haben Zugriff auf alle Tenants
-      userHasAccessToAllTenants: (user) => {
-        const result = Boolean(user?.isSuperAdmin)
-        console.log('[DEBUG:MultiTenant] userHasAccessToAllTenants:', {
-          userId: user?.id,
-          email: user?.email,
-          isSuperAdmin: user?.isSuperAdmin,
-          result,
-          tenants: user?.tenants,
-          userKeys: user ? Object.keys(user) : 'no user',
-        })
-        return result
-      },
+      userHasAccessToAllTenants: (user) => Boolean(user?.isSuperAdmin),
       debug: true,
       // Deutsche Übersetzungen für den Tenant-Selector
       i18n: {