Adding UAC Diameter Range MM to augmented parts

app/models/augmented_part.py

@@ -38,6 +38,11 @@ class AugmentedPart(Base):
         nullable=True,
         default=None,
     )
+    # "##.##-##.##" mm, derived from ImportedPart.UACDiameterRangemm by the sync
+    # service. Read-only — never set outside app/services/augmented_part_sync.py.
+    uac_diameter_range_mm: Mapped[str | None] = mapped_column(
+        String, nullable=True, default=None
+    )
     # Set instead of deleting the row when the last backing ImportedPart is
     # removed, so fit/attachment-point history is preserved. Hidden from list
     # views by default.