feat: sharp edge pipeline V02, tessellation presets, media cache-bust, GMSH plan

Sharp Edge Pipeline V02:
- export_step_to_gltf.py: replace BRep_Tool.Polygon3D_s (returns None in XCAF) with
  GCPnts_UniformAbscissa curve sampling at 0.3mm step — extracts 17,129 segment pairs
- Inject sharp_edge_pairs + sharp_threshold_deg into GLB extras (scenes[0].extras)
  via binary GLB JSON-chunk patching (no extra dependency)
- export_gltf.py: read schaeffler_sharp_edge_pairs from Blender scene custom props,
  apply via KD-tree to mark edges sharp=True + seam=True (OCC mm Z-up → Blender transform)
- tools/restore_sharp_marks.py: dual-pass (dihedral angle + OCC pairs), updated coordinate
  transform (X, -Z, Y) * 0.001

Tessellation:
- Admin UI: Draft / Standard / Fine preset buttons with active-state highlighting
- Default angular deflection: preview 0.5→0.1 rad, production 0.2→0.05 rad
- export_glb.py: read updated defaults from system_settings

Media / Cache:
- media/service.py: get_download_url appends ?v={file_size_bytes} cache-buster
- media/router.py: Cache-Control: no-cache for all download/thumbnail endpoints

Render pipeline:
- still_render.py / turntable_render.py: shared GPU activation + camera improvements
- render_order_line.py: global render position support
- render_thumbnail.py: updated defaults

Frontend:
- InlineCadViewer: file_size_bytes-aware URL update triggers re-fetch on regeneration
- ThreeDViewer: material panel, part selection, PBR mode improvements
- Admin.tsx: tessellation preset cards, GMSH setting dropdown
- MediaBrowser, ProductDetail, OrderDetail, Orders: various UI improvements
- New: MaterialPanel, GlobalRenderPositionsPanel, StepIndicator components
- New: renderPositions.ts API client

Plans / Docs:
- plan.md: GMSH Frontal-Delaunay tessellation plan (6 tasks)
- LEARNINGS.md: OCC Polygon3D_s None issue + GCPnts fix
- .gitignore: add backend/core (core dump from root process)

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

frontend/src/api/cad.ts

@@ -98,8 +98,56 @@ export async function generateGltfProduction(cadFileId: string): Promise<Generat
   return res.data
 }
 
+export interface ParsedObjectsResponse {
+  cad_file_id: string
+  original_name: string
+  processing_status: string
+  parsed_objects: {
+    dimensions_mm?: { x: number; y: number; z: number }
+    bbox_center_mm?: { x: number; y: number; z: number }
+    [key: string]: unknown
+  } | null
+}
+
+/** Return the parsed_objects metadata (dimensions, bbox) for a CAD file. */
+export async function getParsedObjects(cadFileId: string): Promise<ParsedObjectsResponse> {
+  const res = await api.get<ParsedObjectsResponse>(`/cad/${cadFileId}/parsed-objects`)
+  return res.data
+}
+
 /** Force-reset a CAD file stuck in 'processing' to 'failed'. */
 export async function resetStuckProcessing(cadFileId: string): Promise<{ status: string; message: string }> {
   const res = await api.post<{ status: string; message: string }>(`/cad/${cadFileId}/reset-stuck`)
   return res.data
 }
+
+// ---------------------------------------------------------------------------
+// Part-material assignment
+// ---------------------------------------------------------------------------
+
+export interface PartMaterialEntry {
+  type: 'library' | 'hex'
+  value: string
+}
+
+export type PartMaterialMap = Record<string, PartMaterialEntry>
+
+interface PartMaterialsResponse {
+  cad_file_id: string
+  part_materials: PartMaterialMap | null
+}
+
+/** Return the saved part-material assignments for a CAD file (empty object if none). */
+export async function getPartMaterials(cadFileId: string): Promise<PartMaterialMap> {
+  const res = await api.get<PartMaterialsResponse>(`/cad/${cadFileId}/part-materials`)
+  return res.data.part_materials ?? {}
+}
+
+/** Replace the part-material assignment map for a CAD file. Returns the updated map. */
+export async function savePartMaterials(
+  cadFileId: string,
+  map: PartMaterialMap,
+): Promise<PartMaterialMap> {
+  const res = await api.put<PartMaterialsResponse>(`/cad/${cadFileId}/part-materials`, map)
+  return res.data.part_materials ?? {}
+}

frontend/src/api/media.ts

@@ -17,6 +17,7 @@ export interface MediaAssetFilters {
   category_key?: string
   render_status?: string
   q?: string
+  exclude_technical?: boolean
   page?: number
   page_size?: number
 }
@@ -34,6 +35,13 @@ export interface MediaAssetItem {
   product_pim_id: string | null
   category_key: string | null
   render_status: string | null
+  // Extended product metadata
+  product_ebene1: string | null
+  product_ebene2: string | null
+  product_baureihe: string | null
+  product_produkt_baureihe: string | null
+  product_lagertyp: string | null
+  product_name_cad_modell: string | null
   download_url: string | null
   thumbnail_url: string | null
 }
@@ -52,6 +60,7 @@ export function getMediaAssets(filters: MediaAssetFilters = {}): Promise<MediaAs
   if (filters.category_key) params.set('category_key', filters.category_key)
   if (filters.render_status) params.set('render_status', filters.render_status)
   if (filters.q) params.set('q', filters.q)
+  if (filters.exclude_technical !== undefined) params.set('exclude_technical', String(filters.exclude_technical))
   if (filters.page !== undefined) params.set('page', String(filters.page))
   if (filters.page_size !== undefined) params.set('page_size', String(filters.page_size))
   return api.get(`/media/assets?${params}`).then(r => r.data)

frontend/src/api/orders.ts

@@ -2,6 +2,38 @@ import api from './client'
 import type { Product } from './products'
 import type { OutputType } from './outputTypes'
 
+export interface RenderLog {
+  renderer?: string
+  type?: string
+  format?: string
+  engine?: string
+  engine_used?: string
+  samples?: number
+  stl_quality?: string
+  smooth_angle?: number
+  total_duration_s?: number
+  stl_duration_s?: number
+  render_duration_s?: number
+  ffmpeg_duration_s?: number
+  stl_size_bytes?: number
+  output_size_bytes?: number
+  parts_count?: number
+  device_used?: string
+  compute_type?: string
+  gpu_fallback?: boolean
+  frame_count?: number
+  fps?: number
+  template?: string
+  lighting_only?: boolean
+  shadow_catcher?: boolean
+  material_replace?: boolean
+  fallback?: boolean
+  error?: string
+  started_at?: string
+  completed_at?: string
+  log_lines?: string[]
+}
+
 export interface OrderLine {
   id: string
   order_id: string
@@ -21,6 +53,9 @@ export interface OrderLine {
   unit_price: number | null
   render_position_id: string | null
   render_position_name: string | null
+  render_log: RenderLog | null
+  render_started_at: string | null
+  render_completed_at: string | null
   notes: string | null
   created_at: string
   updated_at: string
@@ -30,6 +65,7 @@ export interface OrderLineCreate {
   product_id: string
   output_type_id?: string | null
   render_position_id?: string | null
+  global_render_position_id?: string | null
   gewuenschte_bildnummer?: string | null
   notes?: string | null
 }

frontend/src/api/products.ts

@@ -1,5 +1,5 @@
 import api from './client'
-import type { Order } from './orders'
+import type { Order, RenderLog } from './orders'
 
 export interface RenderPosition {
   id: string
@@ -62,9 +62,11 @@ export interface Product {
     bbox_center_mm?: { x: number; y: number; z: number }
     suggested_smooth_angle?: number
     has_mechanical_edges?: boolean
-    sharp_edge_midpoints?: number[][]
+    sharp_edge_midpoints?: number[][]  // legacy: midpoints only
+    sharp_edge_pairs?: number[][][]    // [[start_xyz, end_xyz], ...] in mm
   } | null
   arbeitspaket: string | null
+  cad_render_log?: RenderLog | null
   notes: string | null
   is_active: boolean
   source_excel: string | null
@@ -152,6 +154,7 @@ export interface ProductRender {
   is_video: boolean
   render_backend: string | null
   completed_at: string | null
+  render_position_name: string | null
 }
 
 export async function getProductRenders(id: string): Promise<ProductRender[]> {

frontend/src/api/renderPositions.ts

@@ -0,0 +1,50 @@
+import api from './client'
+
+export interface GlobalRenderPosition {
+  id: string
+  name: string
+  rotation_x: number
+  rotation_y: number
+  rotation_z: number
+  is_default: boolean
+  sort_order: number
+  created_at: string
+  updated_at: string
+}
+
+export interface GlobalRenderPositionCreate {
+  name: string
+  rotation_x?: number
+  rotation_y?: number
+  rotation_z?: number
+  is_default?: boolean
+  sort_order?: number
+}
+
+export interface GlobalRenderPositionPatch {
+  name?: string
+  rotation_x?: number
+  rotation_y?: number
+  rotation_z?: number
+  is_default?: boolean
+  sort_order?: number
+}
+
+export async function listGlobalRenderPositions(): Promise<GlobalRenderPosition[]> {
+  const res = await api.get<GlobalRenderPosition[]>('/render-positions/global')
+  return res.data
+}
+
+export async function createGlobalRenderPosition(body: GlobalRenderPositionCreate): Promise<GlobalRenderPosition> {
+  const res = await api.post<GlobalRenderPosition>('/render-positions/global', body)
+  return res.data
+}
+
+export async function updateGlobalRenderPosition(id: string, body: GlobalRenderPositionPatch): Promise<GlobalRenderPosition> {
+  const res = await api.patch<GlobalRenderPosition>(`/render-positions/global/${id}`, body)
+  return res.data
+}
+
+export async function deleteGlobalRenderPosition(id: string): Promise<void> {
+  await api.delete(`/render-positions/global/${id}`)
+}