fix: telegraf containers names + openremote pg image + session snapshot 2026-05-25

- telegraf.conf: fix Mosquitto/BunkerM container names (hyphens not underscores)
- tegraf.conf: comment out BunkerM consumer (auth fails, simulator not sending)
- openremote/docker-compose.yml: switch PG image to timescaledb-ha:pg15 (fixes timescaledb_toolkit crash)
- Add session_resume + architecture snapshot 2026-05-25
- Update TODO.md with current status

docker-compose.chirpstack.yml

@@ -2,6 +2,7 @@ version: "3.8"
 
 services:
   chirpstack:
+    container_name: smart-city-chirpstack
     image: chirpstack/chirpstack:latest
     command: -c /etc/chirpstack
     restart: unless-stopped
@@ -22,6 +23,7 @@ services:
       - smartcity-shared
 
   chirpstack-rest-api:
+    container_name: smart-city-chirpstack-rest-api
     image: chirpstack/chirpstack-rest-api:4
     restart: unless-stopped
     command: --server chirpstack:8080 --bind 0.0.0.0:8090 --insecure