feat(telegram-contacts-bot): implement new Telegram bot for contacts

- Add NestJS service with Telegraf for Telegram bot functionality
- Implement commands: /search, /favorites, /recent, /birthdays, /tags, /stats, /add
- Create database schema for user linking and bot settings
- Add Contacts API client for fetching contacts data
- Include birthday detection and upcoming birthdays list
- Add message formatters for German locale
- Include Dockerfile and CLAUDE.md documentation
- Update TELEGRAM_BOTS.md with new bot

Commands implemented:
- /search [name] - Search contacts
- /favorites - Show favorite contacts
- /recent - Recently added contacts
- /birthdays - Upcoming birthdays
- /tags, /tag [name] - Tag management
- /stats - Contact statistics
- /add [name] - Quick-add contact
- /link, /unlink - Account management

https://claude.ai/code/session_01LwmhvhKpEsvVtY1ZKhYu6f

docs/TELEGRAM_BOTS.md

@@ -10,6 +10,7 @@ Dokumentation aller Telegram-Bots im ManaCore Monorepo.
 | [telegram-ollama-bot](#telegram-ollama-bot) | 3301 | Lokale LLM-Inferenz via Ollama | ✅ Aktiv |
 | [telegram-project-doc-bot](#telegram-project-doc-bot) | 3302 | Projektdokumentation & Blogpost-Generierung | ✅ Aktiv |
 | [telegram-calendar-bot](#telegram-calendar-bot) | 3303 | Kalender-Termine & Erinnerungen | 🚧 In Entwicklung |
+| [telegram-contacts-bot](#telegram-contacts-bot) | 3304 | Kontaktsuche & Geburtstags-Erinnerungen | 🚧 In Entwicklung |
 
 ## Gemeinsame Architektur