diff --git a/server/services/previewDeploy.js b/server/services/previewDeploy.js
index 0d73df4..466d75a 100644
--- a/server/services/previewDeploy.js
+++ b/server/services/previewDeploy.js
@@ -250,11 +250,15 @@ async function deployNodeBuild(sourceDir, targetDir) {
     timeout: 15 * 60 * 1000,
     env: { ...process.env, CI: '1' },
   }
+  // Der Server-Container laeuft mit NODE_ENV=production, dadurch setzt npm
+  // automatisch omit=dev. Die Build-Toolchain (Next, Vite, Tailwind, TypeScript)
+  // steht aber in den devDependencies -> ohne "--include=dev" bricht jeder
+  // Build mit "Cannot find module ..." ab (Fall Anelia-Wolf/Next 16).
   try {
-    await execFileAsync('npm', ['ci'], execOpts)
+    await execFileAsync('npm', ['ci', '--include=dev'], execOpts)
   } catch {
     // Ohne (passendes) package-lock.json schlaegt npm ci fehl -> npm install.
-    await execFileAsync('npm', ['install', '--no-audit', '--no-fund'], execOpts)
+    await execFileAsync('npm', ['install', '--include=dev', '--no-audit', '--no-fund'], execOpts)
   }
   await execFileAsync('npm', ['run', 'build'], execOpts)