chore(infra): add sablier-support compose override referenced in .env

.env on Netcup sets COMPOSE_FILE=docker-compose.yml:docker-compose.sablier-support.yml
but the file was never created, causing docker compose commands to fail
without explicit -f flag. Adds the missing override with Sablier labels for
encryptid services (matching the existing sablier-encryptid.yml pattern).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docker-compose.sablier-support.yml

@@ -0,0 +1,10 @@
+services:
+  encryptid:
+    labels:
+      - "sablier.enable=true"
+      - "sablier.group=encryptid"
+      - "traefik.enable=false"
+  encryptid-db:
+    labels:
+      - "sablier.enable=true"
+      - "sablier.group=encryptid"