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/alembic/versions/054_worker_configs.py

@@ -26,7 +26,7 @@ def upgrade() -> None:
         INSERT INTO worker_configs (queue_name, max_concurrency, min_concurrency, enabled)
         VALUES
             ('step_processing', 8, 2, true),
-            ('thumbnail_rendering', 1, 1, true),
+            ('asset_pipeline', 1, 1, true),
             ('ai_validation', 4, 1, true)
         ON CONFLICT DO NOTHING
     """)

backend/alembic/versions/6ebfe2737531_rename_tessellation_settings_gltf_.py

@@ -0,0 +1,44 @@
+"""rename_tessellation_settings_gltf_production_to_scene
+
+Revision ID: 6ebfe2737531
+Revises: 062
+Create Date: 2026-03-12 20:39:36.880236
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '6ebfe2737531'
+down_revision: Union[str, None] = '062'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.execute("""
+        UPDATE system_settings
+        SET key = 'scene_linear_deflection'
+        WHERE key = 'gltf_production_linear_deflection'
+    """)
+    op.execute("""
+        UPDATE system_settings
+        SET key = 'scene_angular_deflection'
+        WHERE key = 'gltf_production_angular_deflection'
+    """)
+
+
+def downgrade() -> None:
+    op.execute("""
+        UPDATE system_settings
+        SET key = 'gltf_production_linear_deflection'
+        WHERE key = 'scene_linear_deflection'
+    """)
+    op.execute("""
+        UPDATE system_settings
+        SET key = 'gltf_production_angular_deflection'
+        WHERE key = 'scene_angular_deflection'
+    """)