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/rendering/tasks.py

@@ -1,6 +1,6 @@
 """Rendering domain tasks — Celery tasks for Blender-based rendering.
 
-These tasks run on the `thumbnail_rendering` queue in the render-worker
+These tasks run on the `asset_pipeline` queue in the render-worker
 container, which has Blender and cadquery available.
 
 Phase A2: Initial implementation replacing the blender-renderer HTTP service.
@@ -48,7 +48,7 @@ def _update_workflow_run_status(order_line_id: str, status: str, error: str | No
 @celery_app.task(
     bind=True,
     name="app.domains.rendering.tasks.render_still_task",
-    queue="thumbnail_rendering",
+    queue="asset_pipeline",
     max_retries=2,
 )
 def render_still_task(
@@ -150,7 +150,7 @@ def render_still_task(
 @celery_app.task(
     bind=True,
     name="app.domains.rendering.tasks.render_turntable_task",
-    queue="thumbnail_rendering",
+    queue="asset_pipeline",
     max_retries=2,
 )
 def render_turntable_task(
@@ -391,7 +391,7 @@ def _resolve_step_path_for_order_line(order_line_id: str) -> tuple[str | None, s
 @celery_app.task(
     bind=True,
     name="app.domains.rendering.tasks.render_order_line_still_task",
-    queue="thumbnail_rendering",
+    queue="asset_pipeline",
     max_retries=2,
 )
 def render_order_line_still_task(self, order_line_id: str, **params) -> dict:
@@ -509,7 +509,7 @@ def render_order_line_still_task(self, order_line_id: str, **params) -> dict:
 @celery_app.task(
     bind=True,
     name="app.domains.rendering.tasks.export_gltf_for_order_line_task",
-    queue="thumbnail_rendering",
+    queue="asset_pipeline",
     max_retries=1,
 )
 def export_gltf_for_order_line_task(self, order_line_id: str) -> dict:
@@ -555,7 +555,7 @@ def export_gltf_for_order_line_task(self, order_line_id: str) -> dict:
 @celery_app.task(
     bind=True,
     name="app.domains.rendering.tasks.export_blend_for_order_line_task",
-    queue="thumbnail_rendering",
+    queue="asset_pipeline",
     max_retries=1,
 )
 def export_blend_for_order_line_task(self, order_line_id: str) -> dict:
@@ -646,7 +646,7 @@ def export_blend_for_order_line_task(self, order_line_id: str) -> dict:
 @celery_app.task(
     bind=True,
     name="app.domains.rendering.tasks.apply_asset_library_materials_task",
-    queue="thumbnail_rendering",
+    queue="asset_pipeline",
     max_retries=1,
 )
 def apply_asset_library_materials_task(self, order_line_id: str, asset_library_id: str) -> dict: