feat: per-position camera settings, material alias dialog, product delete, media browser links

- Per-render-position focal_length_mm/sensor_width_mm (DB → pipeline → Blender)
- FOV-based camera distance with min clamp fix for wide-angle lenses
- Unmapped materials blocking dialog on "Dispatch Renders" with batch alias creation
- Material check endpoint (GET /orders/{id}/check-materials)
- Batch alias endpoint (POST /materials/batch-aliases)
- Quick-map "No alias" badges on Materials page
- Full product hard-delete with storage cleanup (MinIO + disk files + orphaned CadFile)
- Delete button on ProductDetail page with confirmation
- Clickable product names in Media Browser (links to product page)
- Single-line render dispatch/retry (POST /orders/{id}/lines/{id}/dispatch-render)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

render-worker/scripts/export_step_to_gltf.py

@@ -497,56 +497,6 @@ def _collect_part_key_map(shape_tool, free_labels) -> dict:
     return part_key_map
 
 
-def _apply_glb_mm_to_m_scale(glb_path: Path) -> None:
-    """Wrap all GLB scene root nodes under a new root node with scale 0.001.
-
-    RWGltf_CafWriter exports geometry in mm (original STEP units).
-    BRepBuilderAPI_Transform destroys Poly_Triangulation, so we cannot scale
-    the B-Rep before export.  Instead we add a root transform node to the GLB
-    that scales mm → m.  glTF spec uses metres; Three.js and Blender honour
-    node scale transforms.
-
-    The GLB binary is re-serialized in-place.
-    """
-    import struct as _struct
-
-    data = glb_path.read_bytes()
-    json_len = _struct.unpack_from("<I", data, 12)[0]
-    json_type = _struct.unpack_from("<I", data, 16)[0]
-    if json_type != 0x4E4F534A:  # "JSON"
-        return
-
-    j = json.loads(data[20: 20 + json_len])
-
-    if "scenes" not in j or not j["scenes"]:
-        return
-
-    scene = j["scenes"][0]
-    old_roots = scene.get("nodes", [])
-    if not old_roots:
-        return
-
-    # Create a new root node with mm→m scale
-    nodes = j.setdefault("nodes", [])
-    new_root_idx = len(nodes)
-    nodes.append({
-        "name": "__mm_to_m_root__",
-        "scale": [0.001, 0.001, 0.001],
-        "children": old_roots,
-    })
-    scene["nodes"] = [new_root_idx]
-
-    new_json = json.dumps(j, separators=(",", ":"))
-    pad = (4 - len(new_json) % 4) % 4
-    new_json_bytes = new_json.encode() + b" " * pad
-
-    rest = data[20 + json_len:]  # BIN chunk and anything after
-    new_chunk = _struct.pack("<II", len(new_json_bytes), 0x4E4F534A) + new_json_bytes
-    new_total = 12 + len(new_chunk) + len(rest)
-    new_header = _struct.pack("<III", 0x46546C67, 2, new_total)
-    glb_path.write_bytes(new_header + new_chunk + rest)
-
-
 def _inject_glb_extras(glb_path: Path, extras: dict, part_key_map: dict | None = None) -> None:
     """Patch a GLB binary to add/update scenes[0].extras JSON field.
 
@@ -817,8 +767,10 @@ def main() -> None:
     except Exception as _exc:
         print(f"WARNING: GLB extras injection failed (non-fatal): {_exc}", file=sys.stderr)
 
-    # NOTE: RWGltf_CafWriter already converts mm → m and Z-up → Y-up internally.
-    # No additional scaling or coordinate transform is needed.
+    # NOTE: RWGltf_CafWriter reads unit metadata from the XDE document (set by
+    # STEPCAFControl_Reader from the STEP file's SI_UNIT declarations) and converts
+    # mm → m automatically.  It also handles Z-up → Y-up coordinate transform.
+    # No additional scaling or BRepBuilderAPI_Transform is needed.
 
 
 try: