refactor: optimize docker, robust config & country handling

- optimize(docker): use distroless/python3-debian12 & multi-stage build
- feat(app): replace Gunicorn with Waitress (pure python)
- feat(countries): replace static list with pycountry (dynamic & complete)
- feat(config): enforce mandatory APPRISE_URL (fatal if missing)
- feat(logging): add structured logging and graceful shutdown signal handling
- docs: update README with required env var and correct usage

README.md

@@ -17,7 +17,7 @@ L'image Docker est automatiquement construite et poussée sur `gitea.killinger.f
 
 | Variable | Description | Défaut |
 |----------|-------------|--------|
-| `APPRISE_URL` | URL du endpoint Apprise | `http://192.168.1.118:8000/notify/telegram_alerts` |
+| `APPRISE_URL` | URL du endpoint Apprise | **Requis** |
 
 ### Docker Run
 
@@ -25,8 +25,9 @@ L'image Docker est automatiquement construite et poussée sur `gitea.killinger.f
 docker run -d \
   --name crowdsec-notify \
   --restart unless-stopped \
+  -e APPRISE_URL=http://your-apprise-url/notify/my_alert_config \
   -p 5000:5000 \
-  gitea.killinger.fr/services/crowdsec-notify:latest
+  crowdsec-notify:latest
 ```
 
 ## Configuration CrowdSec