refactor: rename thumbnail_rendering queue to asset_pipeline

The queue handles far more than thumbnails: OCC tessellation, USD master
generation, GLB production, order line renders, and workflow renders.
asset_pipeline better reflects its role as the render-worker's primary queue.

Updated all references in: task decorators, celery_app.py, beat_tasks.py,
docker-compose.yml worker command, worker.py MONITORED_QUEUES, admin.py,
CLAUDE.md, LEARNINGS.md, Dockerfile, helpTexts.ts, test files,
and all .claude/commands/*.md skill files.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/domains/materials/tasks.py

@@ -18,7 +18,7 @@ CATALOG_SCRIPT = Path(os.environ.get("RENDER_SCRIPTS_DIR", "/render-scripts")) /
 
 @celery_app.task(
     name="app.domains.materials.tasks.refresh_asset_library_catalog",
-    queue="thumbnail_rendering",
+    queue="asset_pipeline",
     bind=True,
     max_retries=2,
     default_retry_delay=30,