docs(deploy): document optional Laya compose profile (#29)

Update deployment guidance for standard and Laya-profile Compose flows, and mark the Laya service as profile-gated.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docker-compose.yml

@@ -15,13 +15,11 @@ services:
       - PORT=3000 # Internal container port
       - LAYA_BASE_URL=http://laya:8000
       - LAYA_BATCH_TIMEOUT_MS=120000
-    depends_on:
-      laya:
-        condition: service_healthy
     devices:
       - /dev/dri:/dev/dri # Required for VAAPI/QuickSync/AMF (Linux)
 
   laya:
+    profiles: ["laya"]
     build:
       context: .
       dockerfile: Dockerfile.laya