first commit

.env.example

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+# Copy this file to ".env" (same folder as server.js) and fill in your key.
+# The key stays on the server only — it is never sent to the browser.
+
+DEEPL_API_KEY=your-deepl-growth-api-key-here
+
+# Optional: change the local port (default 3000)
+# PORT=3000