infra: bind development services to loopback (#4871)

## What changed

Bind the development Compose stack's published PostgreSQL, Redis,
Adminer, Keycloak, MinIO, and Prometheus ports to `127.0.0.1`.

## Why

Docker publishes a host port on every interface when no host address is
specified. Running the development stack on a remote workstation or VPS
therefore exposes its infrastructure services to that machine's public
networks. Loopback bindings retain host-local development access and
Docker's internal `buzz-net` connectivity without making those services
Internet-reachable.

## Impact

Local workflows continue using the same ports. Deliberate remote
administration now requires an SSH tunnel or another trusted
private-network path.

## Validation

- `docker compose -f docker-compose.yml config --quiet`
- Recreated the six affected services with their existing named volumes
and Docker network
- PostgreSQL remained healthy and retained all 54 application tables
- Redis, MinIO, and Prometheus health checks passed
- All affected ports were closed on the host's public IPv4 and IPv6
addresses while remaining available on loopback

Origin:
`buzz://message?channel=199eb7bc-3feb-484f-ae0e-4995123721ea&id=1c5bc387e86e21bb31677f56e1c862d4d9a17943bce91f8d93e825d029ce7f72`

Signed-off-by: Paweł Karniej <karniej.p@gmail.com>

docker-compose.yml

@@ -10,7 +10,7 @@ services:
       POSTGRES_DB: buzz
       PGDATA: /var/lib/postgresql/data
     ports:
-      - "5432:5432"
+      - "127.0.0.1:5432:5432"
     volumes:
       - postgres-data:/var/lib/postgresql/data
     networks:
@@ -34,7 +34,7 @@ services:
     image: redis:7-alpine
     container_name: buzz-redis
     ports:
-      - "6379:6379"
+      - "127.0.0.1:6379:6379"
     networks:
       - buzz-net
     healthcheck:
@@ -56,7 +56,7 @@ services:
     image: adminer:latest
     container_name: buzz-adminer
     ports:
-      - "8082:8080"
+      - "127.0.0.1:8082:8080"
     networks:
       - buzz-net
     depends_on:
@@ -82,7 +82,7 @@ services:
       KEYCLOAK_ADMIN: admin
       KEYCLOAK_ADMIN_PASSWORD: admin
     ports:
-      - "8180:8080"
+      - "127.0.0.1:8180:8080"
     networks:
       - buzz-net
     healthcheck:
@@ -108,8 +108,8 @@ services:
       MINIO_ROOT_USER: buzz_dev
       MINIO_ROOT_PASSWORD: buzz_dev_secret
     ports:
-      - "9000:9000"
-      - "9001:9001"
+      - "127.0.0.1:9000:9000"
+      - "127.0.0.1:9001:9001"
     volumes:
       - minio-data:/data
     networks:
@@ -152,7 +152,7 @@ services:
     image: prom/prometheus:latest
     container_name: buzz-prometheus
     ports:
-      - "9090:9090"
+      - "127.0.0.1:9090:9090"
     volumes:
       - ./prometheus.yml:/etc/prometheus/prometheus.yml:ro
       - prometheus-data:/prometheus