LogWhispererAI

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Luca Sacchi Ricciardi 3d24dfdeaf feat: complete Sprint 2 with Telegram notifications integration

Add Telegram Bot notification node to n8n workflow:

New Features:
- Telegram notification node for critical severity logs
- Italian message template with emoji and MarkdownV2 formatting
- Smart routing: Telegram only for critical logs
- Error handling: continueOnFail prevents workflow interruption
- Environment-based configuration (TELEGRAM_CHAT_ID)

Message Template Includes:
- 🚨 Alert header with severity
- 📍 Server hostname identification
- 📝 AI-generated problem summary
- 💡 Suggested bash command in code block
- ⚠️ Confirmation required flag
- 📝 Additional notes from AI
- 📊 AI processing status
- 🤖 Model used (openai/gpt-4o-mini)
- ⏰ Localized Italian timestamp

Workflow Flow:
Webhook → HMAC → Validation → PostgreSQL → OpenRouter → Critical? → Telegram → Response
                                                      ↓ FALSE
                                               Success Response

Configuration Required:
1. Create Telegram Bot via @BotFather
2. Get TELEGRAM_BOT_TOKEN
3. Get TELEGRAM_CHAT_ID via @userinfobot
4. Configure credentials in n8n UI
5. Set TELEGRAM_CHAT_ID environment variable

Documentation:
- docs/telegram_setup.md: Setup instructions
- .env.example: Environment variables template
- .gitignore: Protect sensitive telegram_setup.md
- docs/prd.md: Updated Sprint 2 completion status

Sprint 2 Complete:
✅ Secure log ingestion (bash)
✅ n8n webhook workflow
✅ OpenRouter AI integration
✅ PostgreSQL storage
✅ HMAC authentication
✅ Telegram notifications

Refs: docs/specs/ai_pipeline.md, docs/specs/bash_ingestion_secure.md