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/admin/RenderTemplateTable.tsx

@@ -115,7 +115,7 @@ export default function RenderTemplateTable() {
     setEditDraft({
       name: t.name,
       category_key: t.category_key,
-      output_type_id: t.output_type_id,
+      output_type_ids: t.output_type_ids ?? [],
       target_collection: t.target_collection,
       material_replace_enabled: t.material_replace_enabled,
       lighting_only: t.lighting_only,
@@ -320,18 +320,39 @@ export default function RenderTemplateTable() {
                   </td>
                   <td className="px-3 py-2">
                     {isEditing ? (
-                      <select
-                        className={inputCls}
-                        value={editDraft.output_type_id ?? t.output_type_id ?? ''}
-                        onChange={(e) => setEditDraft({ ...editDraft, output_type_id: e.target.value || null })}
-                      >
-                        <option value="">Any</option>
-                        {outputTypes?.map((ot: OutputType) => (
-                          <option key={ot.id} value={ot.id}>{ot.name}</option>
-                        ))}
-                      </select>
+                      <div className="flex flex-col gap-0.5 max-h-32 overflow-y-auto">
+                        {outputTypes?.map((ot: OutputType) => {
+                          const checked = (editDraft.output_type_ids ?? []).includes(ot.id)
+                          return (
+                            <label key={ot.id} className="flex items-center gap-1 text-xs cursor-pointer whitespace-nowrap">
+                              <input
+                                type="checkbox"
+                                checked={checked}
+                                onChange={() => {
+                                  const current = editDraft.output_type_ids ?? []
+                                  const next = checked
+                                    ? current.filter((id: string) => id !== ot.id)
+                                    : [...current, ot.id]
+                                  setEditDraft({ ...editDraft, output_type_ids: next })
+                                }}
+                              />
+                              {ot.name}
+                            </label>
+                          )
+                        })}
+                      </div>
                     ) : (
-                      t.output_type_name || <span className="text-content-muted">Any</span>
+                      t.output_type_names && t.output_type_names.length > 0 ? (
+                        <div className="flex flex-wrap gap-1">
+                          {t.output_type_names.map((name, i) => (
+                            <span key={i} className="inline-block text-xs px-1.5 py-0.5 bg-blue-100 text-blue-800 rounded">
+                              {name}
+                            </span>
+                          ))}
+                        </div>
+                      ) : (
+                        <span className="text-content-muted">Any</span>
+                      )
                     )}
                   </td>
                   <td className="px-3 py-2">