feat: add Phusion Passenger server.js for Plesk deployment

Required by Plesk Node.js Manager to start the Next.js production server
via Phusion Passenger. Uses CommonJS for Passenger compatibility.

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

server.js

@@ -0,0 +1,26 @@
+#\!/usr/bin/env node
+/**
+ * Plesk Node.js Manager Entry Point (Phusion Passenger)
+ * Starts Next.js production server for porwoll.de
+ */
+
+const { createServer } = require("http")
+const { parse } = require("url")
+const next = require("next")
+
+const port = parseInt(process.env.PORT || "3000", 10)
+const dev = process.env.NODE_ENV \!== "production"
+const app = next({ dev })
+const handle = app.getRequestHandler()
+
+app.prepare().then(() => {
+  createServer((req, res) => {
+    const parsedUrl = parse(req.url, true)
+    handle(req, res, parsedUrl)
+  }).listen(port, "0.0.0.0", (err) => {
+    if (err) throw err
+    console.log(`Next.js server ready on http://0.0.0.0:${port}`)
+    console.log(`Environment: ${process.env.NODE_ENV}`)
+    console.log(`Site: porwoll.de`)
+  })
+})