update

backend/.env.example

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+# MongoDB Configuration
+MONGODB_URI=mongodb://localhost:27017/
+
+# Email Configuration (Required)
+SMTP_SERVER=smtp.gmail.com
+SMTP_PORT=587
+EMAIL_USER=your-email@gmail.com
+EMAIL_PASSWORD=your-app-password
+
+# Newsletter Settings
+NEWSLETTER_MAX_ARTICLES=10
+NEWSLETTER_HOURS_LOOKBACK=24
+WEBSITE_URL=http://localhost:3000
+
+# Tracking Configuration
+TRACKING_ENABLED=true
+TRACKING_API_URL=http://localhost:5001
+TRACKING_DATA_RETENTION_DAYS=90
+
+# Ollama Configuration (AI Summarization)
+OLLAMA_ENABLED=true
+OLLAMA_BASE_URL=http://127.0.0.1:11434
+OLLAMA_MODEL=phi3:latest
+OLLAMA_TIMEOUT=120
+SUMMARY_MAX_WORDS=150
+
+# Flask Server Configuration
+FLASK_PORT=5001