feat(O): UI-Vollständigkeit + v3-Workflows + OCC-Kantenanalyse

Backend:
- Phase I: notification_configs router (GET/PUT/{event}/{channel}/POST reset)
  war bereits in notifications.py — add-alias endpoint in uploads.py ergänzt
- OutputType schema: workflow_definition_id + workflow_name fields;
  PATCH unterstützt Workflow-Zuweisung; _enrich_workflow_names() batch query
- Dispatch-Integration: orders.py dispatch_renders() → dispatch_render_with_workflow()
  mit Legacy-Fallback; neues Logging
- uploads.py: POST /validations/{id}/add-alias für Material-Lücken

Pipeline:
- step_processor.py: extract_mesh_edge_data() via OCC — berechnet Dihedralwinkel
  aller Kanten, liefert suggested_smooth_angle + sharp_edge_midpoints
  Integriert in extract_cad_metadata() und process_cad_file()
- domains/rendering/tasks.py: apply_asset_library_materials_task (K3),
  export_gltf_for_order_line_task → Blender export_gltf.py (K4),
  export_blend_for_order_line_task → export_blend.py fix (K5)
- render-worker/scripts/still_render.py: _mark_sharp_and_seams() mit
  OCC midpoint KD-tree matching + UV-Seam-Markierung
- render-worker/scripts/blender_render.py: identische Funktion + mesh_attributes parsing

Frontend:
- Layout.tsx: Upload-Link in Sidebar (alle User); Asset Libraries Link (admin/PM)
- App.tsx: /asset-libraries Route
- AssetLibrary.tsx: neue Seite (Upload, Catalog-Anzeige, Refresh, Toggle, Delete)
- OutputTypeTable.tsx: Workflow-Dropdown + Legacy/Workflow Badge
- ProductDetail.tsx: Geometry-Karte (Volumen, Surface, BBox, Sharp-Winkel)
- api/outputTypes.ts + api/products.ts: neue Felder
- api/imports.ts: ImportValidation API

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

backend/app/api/routers/uploads.py

@@ -450,3 +450,56 @@ async def get_import_validation(
     if not val:
         raise HTTPException(404, detail="Validation not found")
     return ImportValidationOut.model_validate(val)
+
+
+class AddAliasRequest(BaseModel):
+    part_name: str
+    material_name: str
+
+
+@router.post("/validations/{validation_id}/add-alias", status_code=status.HTTP_201_CREATED)
+async def add_material_alias_from_validation(
+    validation_id: uuid.UUID,
+    body: AddAliasRequest,
+    db: AsyncSession = Depends(get_db),
+    user: User = Depends(get_current_user),
+):
+    """Create a MaterialAlias entry mapping part_name to an existing material.
+
+    Requires admin or project_manager role.
+    """
+    from app.utils.auth import require_admin_or_pm
+    from app.domains.imports.models import ImportValidation
+    from app.domains.materials.models import Material, MaterialAlias
+
+    # Gate to admin/PM
+    if user.role.value not in ("admin", "project_manager"):
+        raise HTTPException(status_code=403, detail="Admin or project_manager required")
+
+    # Verify the validation exists
+    val_result = await db.execute(select(ImportValidation).where(ImportValidation.id == validation_id))
+    if not val_result.scalar_one_or_none():
+        raise HTTPException(404, detail="Validation not found")
+
+    # Find the target material by name
+    mat_result = await db.execute(select(Material).where(Material.name == body.material_name))
+    material = mat_result.scalar_one_or_none()
+    if not material:
+        raise HTTPException(404, detail=f"Material '{body.material_name}' not found in library")
+
+    # Check for duplicate alias (case-insensitive)
+    from sqlalchemy import func as sql_func
+    dup_result = await db.execute(
+        select(MaterialAlias).where(
+            sql_func.lower(MaterialAlias.alias) == body.part_name.lower()
+        )
+    )
+    existing_alias = dup_result.scalar_one_or_none()
+    if existing_alias:
+        raise HTTPException(409, detail=f"Alias '{body.part_name}' already exists")
+
+    alias = MaterialAlias(material_id=material.id, alias=body.part_name)
+    db.add(alias)
+    await db.commit()
+    await db.refresh(alias)
+    return {"id": str(alias.id), "alias": alias.alias, "material_id": str(material.id), "material_name": material.name}