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README.md

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+# DeepLite BFF Server
+
+Backend-for-Frontend proxy server for the DeepLite PWA.
+
+## Configuration
+
+Create a `.env` file:
+
+```env
+DEEPL_AUTH_KEY=your-deepl-api-key
+BEARER_TOKEN=your-secure-token
+PORT=8000
+```
+
+## API Endpoints
+
+### POST /translate
+
+Translates text using the DeepL API.
+
+```bash
+curl -X POST http://localhost:8000/translate \
+  -H "Authorization: Bearer YOUR_BEARER_TOKEN" \
+  -H "Content-Type: application/json" \
+  -d '{"text": "Hello world!", "target_lang": "FR"}'
+```
+
+**Parameters:**
+
+- `text` (required): Text to translate
+- `target_lang` (required): Target language code (e.g., "FR", "DE", "ES")
+- `source_lang` (optional): Source language code (auto-detected if not provided)
+
+### GET /languages
+
+Retrieves the list of supported languages.
+
+```bash
+curl http://localhost:8000/languages \
+  -H "Authorization: Bearer YOUR_BEARER_TOKEN"
+```
+
+### GET /health
+
+Health check endpoint (no authentication required).
+
+```bash
+curl http://localhost:8000/health
+```