feat: add chat group daily summarizer

- Telegram collector (Telethon MTProto) with checkpoint-based message fetching
- Claude API summarization via proxy (haiku model)
- Dashboard page with date picker, markdown summary, raw message drill-down
- Separate container lifecycle from dashboard for stable Telethon sessions
- Shared SQLite DB mounted read-only into dashboard

dashboard/docker-compose.yml

@@ -45,6 +45,7 @@ services:
       - /volume1/docker/nas-dashboard/ssh/dashboard_terminal:/app/ssh/id_ed25519:ro
       - /volume1/docker/nas-dashboard/ssh/vps_terminal:/app/ssh/vps_id_ed25519:ro
       - /volume1/docker/nas-dashboard/ssh/known_hosts:/app/ssh/known_hosts:ro
+      - /volume1/docker/chat-summarizer/data:/app/data/chat-summarizer:ro
     healthcheck:
       test: ["CMD", "python", "-c", "import urllib.request; urllib.request.urlopen('http://localhost:4000/api/health')"]
       interval: 30s