feat: create net stack consolidating proxy, netdata, watchtower, and umami

- Create net/compose.yaml with 4 services (traefik, netdata, watchtower, umami)
- Update arty.yml with NET_* environment variables
- Update compose.yaml to include net instead of individual stacks
- Update restic volume references to net_letsencrypt_data and net_netdata_config
- Copy configuration files to net/ directory (Dockerfile, dynamic/, go.d/, etc.)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

arty.yml

@@ -19,12 +19,6 @@ envs:
     CORE_REDIS_PORT: 6379
     CORE_REDIS_IMAGE: redis:7-alpine
     CORE_POSTGRES_IMAGE: postgres:16-alpine
-    # Track
-    TRACK_TRAEFIK_ENABLED: true
-    TRACK_COMPOSE_PROJECT_NAME: track
-    TRACK_DOCKER_IMAGE: ghcr.io/umami-software/umami:postgresql-latest
-    TRACK_TRAEFIK_HOST: umami.pivoine.art
-    TRACK_DB_NAME: umami
     # Sexy
     SEXY_TRAEFIK_ENABLED: true
     SEXY_COMPOSE_PROJECT_NAME: sexy
@@ -123,20 +117,23 @@ envs:
     DEV_ASCIINEMA_TRAEFIK_HOST: asciinema.dev.pivoine.art
     DEV_ASCIINEMA_DB_NAME: asciinema
     DEV_ASCIINEMA_SIGN_UP_DISABLED: true
-    # PairDrop
-    DROP_TRAEFIK_ENABLED: true
-    DROP_COMPOSE_PROJECT_NAME: drop
-    DROP_TRAEFIK_HOST: drop.pivoine.art
+    # Net (Traefik Proxy, Netdata, Watchtower, Umami)
+    NET_TRAEFIK_ENABLED: true
+    NET_COMPOSE_PROJECT_NAME: net
+    # Traefik Proxy
+    NET_PROXY_DOCKER_IMAGE: traefik:latest
+    NET_PROXY_TRAEFIK_HOST: proxy.pivoine.art
+    NET_PROXY_PORT_HTTP: 80
+    NET_PROXY_PORT_HTTPS: 443
+    NET_PROXY_LOG_LEVEL: INFO
     # Netdata
-    NETDATA_TRAEFIK_ENABLED: true
-    NETDATA_COMPOSE_PROJECT_NAME: netdata
-    NETDATA_IMAGE: netdata/netdata:latest
-    NETDATA_TRAEFIK_HOST: netdata.pivoine.art
-    NETDATA_HOSTNAME: netdata.pivoine.art
-    # Proxy
-    PROXY_COMPOSE_PROJECT_NAME: proxy
-    PROXY_DOCKER_IMAGE: traefik:latest
-    PROXY_TRAEFIK_HOST: proxy.pivoine.art
+    NET_NETDATA_IMAGE: netdata/netdata:latest
+    NET_NETDATA_TRAEFIK_HOST: netdata.pivoine.art
+    NET_NETDATA_HOSTNAME: netdata.pivoine.art
+    # Umami Analytics
+    NET_TRACK_DOCKER_IMAGE: ghcr.io/umami-software/umami:postgresql-latest
+    NET_TRACK_TRAEFIK_HOST: umami.pivoine.art
+    NET_TRACK_DB_NAME: umami
     # AI Stack
     AI_TRAEFIK_ENABLED: true
     AI_COMPOSE_PROJECT_NAME: ai