Adds x_fc_default_coating_config_id and x_fc_default_treatment_ids
fields on fp.part.catalog. Wizard line gets a push_to_defaults
toggle. After action_create_order confirms the SO, any line with
push_to_defaults=True writes its coating + treatments back onto the
part catalog entry as the new defaults.
Reverse direction too: onchange on part_catalog_id in the wizard
line seeds coating + treatments from the part's defaults (if set and
the line doesn't already have them).
Part catalog form gets a new "Defaults" tab showing the stored
defaults. Smoke-tested: pushing default on order 1 populates the
catalog entry; new wizard line for that part auto-seeds the coating.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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