feat(K): Blender Asset Library + production exports (GLB + .blend)

- feat(migration): 045_asset_libraries — new asset_libraries table (blend_file_path, catalog JSONB)
- feat(model): AssetLibrary SQLAlchemy model in domains/materials/models.py
- feat(api): POST/GET/PATCH/DELETE /api/asset-libraries + /upload-blend + /refresh-catalog endpoints
- feat(celery): refresh_asset_library_catalog task on thumbnail_rendering queue — runs Blender headless
- feat(blender): catalog_assets.py — extracts asset-marked materials + node_groups from .blend
- feat(blender): asset_library.py — apply_asset_library_materials + apply_asset_library_node_groups helpers
- feat(blender): export_gltf.py — STEP→STL→GLB production export with optional asset library
- feat(blender): export_blend.py — STEP→STL→.blend production export with pack_all()
- feat(frontend): api/assetLibraries.ts — full CRUD API client
- feat(frontend): AssetLibraryPanel in Admin.tsx — upload, refresh, expand catalog view
- docs: Blender asset_data marking requirement learning in LEARNINGS.md

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

frontend/src/api/assetLibraries.ts

@@ -0,0 +1,60 @@
+import api from './client'
+
+export interface AssetLibraryCatalog {
+  materials: string[]
+  node_groups: string[]
+}
+
+export interface AssetLibrary {
+  id: string
+  name: string
+  description: string | null
+  original_filename: string | null
+  catalog: AssetLibraryCatalog
+  is_active: boolean
+  created_at: string
+  updated_at: string
+}
+
+export async function listAssetLibraries(): Promise<AssetLibrary[]> {
+  const { data } = await api.get<AssetLibrary[]>('/asset-libraries')
+  return data
+}
+
+export async function getAssetLibrary(id: string): Promise<AssetLibrary> {
+  const { data } = await api.get<AssetLibrary>(`/asset-libraries/${id}`)
+  return data
+}
+
+export async function createAssetLibrary(params: {
+  name: string
+  description?: string
+  blend_file: File
+}): Promise<AssetLibrary> {
+  const form = new FormData()
+  form.append('name', params.name)
+  if (params.description) form.append('description', params.description)
+  form.append('blend_file', params.blend_file)
+  const { data } = await api.post<AssetLibrary>('/asset-libraries', form, {
+    headers: { 'Content-Type': 'multipart/form-data' },
+  })
+  return data
+}
+
+export async function uploadAssetLibraryBlend(id: string, file: File): Promise<AssetLibrary> {
+  const form = new FormData()
+  form.append('blend_file', file)
+  const { data } = await api.post<AssetLibrary>(`/asset-libraries/${id}/upload-blend`, form, {
+    headers: { 'Content-Type': 'multipart/form-data' },
+  })
+  return data
+}
+
+export async function refreshAssetLibraryCatalog(id: string): Promise<AssetLibrary> {
+  const { data } = await api.post<AssetLibrary>(`/asset-libraries/${id}/refresh-catalog`)
+  return data
+}
+
+export async function deleteAssetLibrary(id: string): Promise<void> {
+  await api.delete(`/asset-libraries/${id}`)
+}