fix: Grafana dashboard 'no data' — datasource + Flux queries

- Fix datasource: bucket=smartcity, token=my-super-token, org=digitribe
- Fix dashboard queries: filter by topic tag instead of _measurement
  (all data in measurement 'mqtt_consumer', type in tag 'topic')
- Fix field names: temperature_c→temperature_celsius, luminosity→brightness_lux
- Update dashboard to v3 with 15 panels (airquality, traffic, parking, weather, noise, light)
- Update TODO.md and session_resume

Tested: PM2.5 ✅, Temperature ✅, Vehicle Count ✅ via Grafana API

grafana/provisioning/datasources/datasources.yml

@@ -1,9 +1,8 @@
 # Grafana datasources - Smart City Digital Twin Martinique
-# Each datasource is editable and uses the container DNS name in smartcity-shared network
 apiVersion: 1
 
 datasources:
-  # ── InfluxDB v2 (time-series IoT data) ──────────────────────────────────────
+  # InfluxDB v2 (time-series IoT data)
   - name: InfluxDB-v2
     type: influxdb
     access: proxy
@@ -13,12 +12,12 @@ datasources:
     jsonData:
       version: Flux
       organization: digitribe
-      defaultBucket: iot_data
+      defaultBucket: smartcity
+      tlsSkipVerify: true
     secureJsonData:
-      token: my-super-secret-admin-token
+      token: my-super-token
 
-  # ── FIWARE Orion-LD (NGSI-LD context broker) ────────────────────────────────
-  # Requires grafana-simple-json-datasource plugin
+  # FIWARE Orion-LD
   - name: FIWARE Orion
     type: grafana-simple-json-datasource
     access: proxy
@@ -28,8 +27,7 @@ datasources:
       queryURLTemplate: "/ngsi-ld/v1/entities?type={{type}}"
       method: GET
 
-  # ── GeoServer WMS (spatial data) ────────────────────────────────────────────
-  # GeoServer is an external service reachable via its container name
+  # GeoServer WMS
   - name: GeoServer WMS
     type: grafana-simple-json-datasource
     access: proxy
@@ -39,8 +37,7 @@ datasources:
       queryURLTemplate: "/geoserver/wfs?service=WFS&version=2.0&request=GetFeature&typeName={{type}}"
       method: GET
 
-  # ── FROST-Server (SensorThings API) ──────────────────────────────────────────
-  # Requires grafana-simple-json-datasource plugin
+  # FROST-Server
   - name: FROST-Server
     type: grafana-simple-json-datasource
     access: proxy