feat(configurator): per-customer default lead time on partner profile

Adds two Integer fields to res.partner:
  - x_fc_default_lead_time_min_days
  - x_fc_default_lead_time_max_days

Set once on the customer's Plating Defaults tab (Fulfilment group);
auto-copies onto every new Express Order via the existing
_onchange_partner_id hook. Operator can still override per-order
since the onchange only fills when the wizard field is still blank.

Field declaration lives in fusion_plating_configurator (alongside
the rest of the partner cascade reads). View edit lives in
fusion_plating_invoicing where the Plating Defaults tab already
hosts the other partner-level defaults (invoice strategy, deposit
%, delivery method, deadline-days). Invoicing depends on
configurator, so the fields are registered before the view loads.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

fusion_plating/fusion_plating_configurator/__manifest__.py

@@ -5,7 +5,7 @@
 
 {
     'name': 'Fusion Plating — Configurator',
-    'version': '19.0.22.6.0',
+    'version': '19.0.22.7.0',
     'category': 'Manufacturing/Plating',
     'summary': 'Quotation configurator with part catalog, coating configs, and formula-based pricing engine.',
     'description': """