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/media/models.py

@@ -14,8 +14,8 @@ class MediaAssetType(str, enum.Enum):
     turntable = "turntable"
     stl_low = "stl_low"
     stl_high = "stl_high"
-    gltf_geometry = "gltf_geometry"
-    gltf_production = "gltf_production"
+    gltf_geometry = "gltf_geometry"      # DEPRECATED: use usd_master — viewer GLB auto-generated as part of USD pipeline
+    gltf_production = "gltf_production"  # DEPRECATED: use usd_master — high-quality production GLB superseded by USD master
     blend_production = "blend_production"
     usd_master = "usd_master"