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/api/cad.ts

@@ -97,3 +97,9 @@ export async function generateGltfProduction(cadFileId: string): Promise<Generat
   const res = await api.post<GenerateGltfResponse>(`/cad/${cadFileId}/generate-gltf-production`)
   return res.data
 }
+
+/** Force-reset a CAD file stuck in 'processing' to 'failed'. */
+export async function resetStuckProcessing(cadFileId: string): Promise<{ status: string; message: string }> {
+  const res = await api.post(`/cad/${cadFileId}/reset-stuck`)
+  return res.data
+}

frontend/src/api/renderTemplates.ts

@@ -6,6 +6,8 @@ export interface RenderTemplate {
   category_key: string | null;
   output_type_id: string | null;
   output_type_name: string | null;
+  output_type_ids: string[];
+  output_type_names: string[];
   blend_file_path: string;
   original_filename: string;
   target_collection: string;
@@ -39,7 +41,7 @@ export async function createRenderTemplate(formData: FormData): Promise<RenderTe
 
 export async function updateRenderTemplate(
   id: string,
-  updates: Partial<Pick<RenderTemplate, 'name' | 'category_key' | 'output_type_id' | 'target_collection' | 'material_replace_enabled' | 'lighting_only' | 'shadow_catcher_enabled' | 'camera_orbit' | 'is_active'>>,
+  updates: Partial<Pick<RenderTemplate, 'name' | 'category_key' | 'output_type_ids' | 'target_collection' | 'material_replace_enabled' | 'lighting_only' | 'shadow_catcher_enabled' | 'camera_orbit' | 'is_active'>>,
 ): Promise<RenderTemplate> {
   const { data } = await api.patch(`/render-templates/${id}`, updates);
   return data;

frontend/src/api/workflows.ts

@@ -10,7 +10,7 @@ export interface WorkflowDefinition {
 }
 
 export interface WorkflowConfig {
-  type: 'still' | 'turntable' | 'multi_angle' | 'custom'
+  type: 'still' | 'turntable' | 'multi_angle' | 'still_with_exports' | 'custom'
   params: WorkflowParams
   nodes?: WorkflowNode[]
 }