feat(invoicing): module scaffold + strategy defaults + account hold

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

fusion-plating/fusion_plating_invoicing/models/res_partner.py

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+# -*- coding: utf-8 -*-
+# Copyright 2026 Nexa Systems Inc.
+# License OPL-1 (Odoo Proprietary License v1.0)
+# Part of the Fusion Plating product family.
+
+from odoo import fields, models
+
+
+class ResPartner(models.Model):
+    _inherit = 'res.partner'
+
+    x_fc_account_hold = fields.Boolean(
+        string='Account Hold', tracking=True,
+        help='When active, blocks SO confirmation, invoicing, and shipping.',
+    )
+    x_fc_account_hold_reason = fields.Text(string='Hold Reason')
+    x_fc_account_hold_date = fields.Datetime(
+        string='Hold Date', help='When the hold was placed.',
+    )
+    x_fc_account_hold_by_id = fields.Many2one(
+        'res.users', string='Hold Placed By',
+    )