feat(auth): Blessing Skin variant as Drasl alternative

Override stack that swaps Drasl for Blessing Skin Server + MariaDB,
talking to Minecraft via the yggdrasil-api plugin (authlib endpoint
/api/yggdrasil, ONLINE_MODE=TRUE). Caddy auth.* repointed to
blessing-skin:80; Drasl left idle (compose merges depends_on).

Run: docker compose -f docker-compose.yml -f docker-compose.blessingskin.yml up -d

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.env.example

@@ -17,3 +17,13 @@ ENABLE_MDNS=false
 RCON_PASSWORD=change-me-to-something-random
 # Only needed if using CurseForge-exclusive mods:
 # CF_API_KEY=your-curseforge-api-key
+
+# ── Blessing Skin auth variant (docker-compose.blessingskin.yml) ──────
+# Only needed when running the Blessing Skin override instead of Drasl.
+BS_DB_NAME=blessingskin
+BS_DB_USER=blessingskin
+BS_DB_PASSWORD=change-me-bs-db
+BS_DB_ROOT_PASSWORD=change-me-bs-root
+# Generate once and paste here so it survives container recreates:
+#   docker run --rm azusamikan/blessing-skin-server-docker:latest php artisan key:generate --show
+BS_APP_KEY=base64:replace-with-generated-key