feat: GPU rendering + material matching + perf improvements

- GPU: fix Cycles device activation order — set compute_device_type
  BEFORE engine init, re-set AFTER open_mainfile wipes preferences
- GPU: remove _mark_sharp_and_seams edit-mode loop (redundant with
  Blender 5.0 shade_smooth_by_angle), saves ~200s/render on 175 parts
- Material: fix _AFN suffix mismatch — build AF-stripped mat_map keys
  and add prefix fallback in _apply_material_library (blender_render.py)
- Material: production GLB now uses get_material_library_path() which
  checks active AssetLibrary instead of empty legacy system setting
- Admin: RenderTemplateTable multi-select output types (M2M frontend)
- Admin: MaterialLibraryPanel replaced with link to Asset Libraries
- UX: move Toaster to top-left to avoid dispatch button overlap
- SQLAlchemy: add .unique() to all RenderTemplate M2M collection queries
- Logging: flush=True on all Blender progress prints, stdout reconfigure

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

frontend/src/components/cad/InlineCadViewer.tsx

@@ -4,13 +4,14 @@ import { Canvas } from '@react-three/fiber'
 import { OrbitControls, useGLTF, Environment } from '@react-three/drei'
 import * as THREE from 'three'
 import { mergeVertices } from 'three/examples/jsm/utils/BufferGeometryUtils.js'
-import { Loader2, Box, RefreshCw, Grid3X3, Layers, Sun } from 'lucide-react'
+import { Loader2, Box, RefreshCw, Grid3X3, Layers, Sun, Cpu } from 'lucide-react'
 import { toast } from 'sonner'
 import { getMediaAssets } from '../../api/media'
 import { generateGltfGeometry } from '../../api/cad'
 import { useAuthStore } from '../../store/auth'
 
 type ViewMode = 'solid' | 'wireframe'
+type GlbSource = 'geometry' | 'production'
 type LightPreset = 'studio' | 'warehouse' | 'sunset' | 'park' | 'city'
 
 const LIGHT_PRESETS: { id: LightPreset; label: string }[] = [
@@ -91,6 +92,7 @@ export default function InlineCadViewer({
   const [loadingGlb, setLoadingGlb] = useState(false)
   const [generating, setGenerating] = useState(false)
   const [viewMode, setViewMode] = useState<ViewMode>('solid')
+  const [glbSource, setGlbSource] = useState<GlbSource>('geometry')
   const [lightPreset, setLightPreset] = useState<LightPreset>('studio')
 
   const { data: gltfAssets } = useQuery({
@@ -100,20 +102,35 @@ export default function InlineCadViewer({
     refetchInterval: generating ? 4_000 : false,
   })
 
+  const { data: productionAssets } = useQuery({
+    queryKey: ['media-assets', cadFileId, 'gltf_production'],
+    queryFn: () => getMediaAssets({ cad_file_id: cadFileId, asset_types: ['gltf_production'] }),
+    staleTime: 0,
+  })
+
   useEffect(() => {
     if (generating && gltfAssets && gltfAssets.length > 0) setGenerating(false)
   }, [generating, gltfAssets])
 
-  const latestAsset = gltfAssets?.[0]
-  const downloadUrl = latestAsset?.download_url
+  const hasGeometry = (gltfAssets?.length ?? 0) > 0
+  const hasProduction = (productionAssets?.length ?? 0) > 0
+
+  // Auto-switch to production if it's the only available source
+  useEffect(() => {
+    if (!hasGeometry && hasProduction) setGlbSource('production')
+  }, [hasGeometry, hasProduction])
+
+  const activeDownloadUrl =
+    glbSource === 'production'
+      ? productionAssets?.[0]?.download_url
+      : gltfAssets?.[0]?.download_url
 
   useEffect(() => {
-    if (!downloadUrl || !token) return
-    // Clear stale mesh immediately so the loading spinner shows instead of old geometry
+    if (!activeDownloadUrl || !token) return
     setGlbBlobUrl(null)
     setLoadingGlb(true)
     let blobUrl = ''
-    fetch(downloadUrl, { headers: { Authorization: `Bearer ${token}` } })
+    fetch(activeDownloadUrl, { headers: { Authorization: `Bearer ${token}` } })
       .then((r) => r.blob())
       .then((blob) => {
         blobUrl = URL.createObjectURL(blob)
@@ -124,7 +141,7 @@ export default function InlineCadViewer({
     return () => {
       if (blobUrl) URL.revokeObjectURL(blobUrl)
     }
-  }, [downloadUrl, token])
+  }, [activeDownloadUrl, token])
 
   const generateMut = useMutation({
     mutationFn: () => generateGltfGeometry(cadFileId),
@@ -149,6 +166,19 @@ export default function InlineCadViewer({
 
         {/* Toolbar */}
         <div className="absolute top-2 right-2 flex flex-col gap-1 items-end">
+          {/* Geometry / Production toggle — only when both exist */}
+          {hasGeometry && hasProduction && (
+            <div className="flex rounded-md overflow-hidden border border-white/10 bg-black/50 backdrop-blur-sm">
+              <ToolbarBtn active={glbSource === 'geometry'} onClick={() => setGlbSource('geometry')} title="Geometry GLB (OCC, no materials)">
+                <Box size={12} /> Geo
+              </ToolbarBtn>
+              <div className="w-px bg-white/10" />
+              <ToolbarBtn active={glbSource === 'production'} onClick={() => setGlbSource('production')} title="Production GLB (Blender + PBR materials)">
+                <Cpu size={12} /> PBR
+              </ToolbarBtn>
+            </div>
+          )}
+
           {/* View mode */}
           <div className="flex rounded-md overflow-hidden border border-white/10 bg-black/50 backdrop-blur-sm">
             <ToolbarBtn active={viewMode === 'solid'} onClick={() => setViewMode('solid')} title="Solid">