feat: activate BunkerM MQTT broker + fix Telegraf

- BunkerM: recreated with port 1883 (external) -> 1900 (internal)
- BunkerM: disabled dynsec plugin, using password_file auth (bunker/bunker)
- Simulator: ENABLE_BUNKER=1, BUNKERM_PORT=1900
- Telegraf: reactivated BunkerM consumer on port 1900
- Telegraf: recreated container (3 MQTT consumers connected)
- Grafana: dashboard v4 with corrected Flux queries
- Grafana: datasource fixed (bucket=smartcity, token=my-super-token)

Verified:
- Simulator publishes to EMQX ✅, Mosquitto ✅, BunkerM ✅
- Telegraf receives from all 3 brokers ✅
- InfluxDB has data from all brokers ✅
- Grafana dashboard displays data ✅

snapshots/2026-05-26/ARCHITECTURE.md

@@ -0,0 +1,57 @@
+# Snapshot 2026-05-26 — Smart City Digital Twin Martinique
+
+## État des services
+
+### Pipeline de données ✅ FONCTIONNEL
+```
+Simulateur (60 capteurs) → EMQX + Mosquitto → Telegraf → InfluxDB → Grafana
+```
+
+### Containers UP
+| Container | Status | Notes |
+|-----------|--------|-------|
+| smart-city-simulator | ✅ Up 2j | 60 capteurs, MQTT OK |
+| smart-city-telegraf | ✅ Up | Connecté EMQX + Mosquitto |
+| smart-city-influxdb | ✅ Up healthy | Bucket `smartcity` with data |
+| smart-city-grafana | ✅ Up | Dashboard v3, datasource corrigé |
+| openremote-postgresql | ✅ Up healthy | timescaledb-ha:pg15 |
+| openremote-keycloak | ✅ Up | Recréé manuellement |
+| openremote-manager | ❌ Crash loop | Flyway corrigé mais PG recréé |
+| contexus-app | ⚠️ Unhealthy | Postgres/Redis OK |
+| contexus-postgres | ✅ Up healthy | |
+| contexus-redis | ✅ Up healthy | |
+
+### Containers DOWN (intentionnel pour CPU)
+- ThingsBoard, Pulsar, Redpanda, FROST, Stellio, Orion-LD
+
+## Données InfluxDB confirmées
+- Bucket: `smartcity`
+- Measurement: `mqtt_consumer`
+- Tag `topic`: `smartcity/{type}/{id}` (ex: `smartcity/airquality/1`)
+- Types: airquality(20), parking(20), traffic(10), weather(10), light(5), noise(5)
+
+## Grafana Dashboard
+- UID: `smartcity-martinique-complete`
+- URL: https://grafana.digitribe.fr/d/smartcity-martinique-complete/smart-city-digital-twin-martinique-complet
+- Version: 3 (15 panels, requêtes Flux corrigées)
+- Datasource: InfluxDB-SmartCity-Correct (uid: dd1bfc24-...)
+
+## Fichiers modifiés cette session
+- `grafana-datasources.yml`
+- `grafana-dashboard-smartcity.json`
+- `grafana/provisioning/dashboards/smart-city-dashboards.json`
+- `grafana/provisioning/datasources/datasources.yml`
+- `openremote/docker-compose.yml` (OR_SETUP_TYPE: "default")
+- `TODO.md` (home + projet)
+- `session_resume_2026-05-26.md` (nouveau)
+
+## Commit
+- `5bbd5a6` — "fix: Grafana dashboard 'no data' — datasource + Flux queries"
+- Push Gitea: ❌ (502 Bad Gateway)
+
+## Prochaines étapes
+1. Recloner le répertoire (décision utilisateur)
+2. Relancer OpenRemote après reclonage
+3. Push Gitea quand le serveur sera accessible
+4. Configurer les 60 devices Contexus
+5. Activer BunkerM dans Telegraf