feat(numbering): wire CoC/RCV/DLV/PU into parent-numbered mixin + rename counters

Per-model counter fields on sale.order renamed to x_fc_pn_*_count
to avoid collision with pre-existing compute fields of the same
short name in bridge_mrp / receiving / configurator (silent
compute-override was suppressing the storage). 4 child models
(fp.certificate, fp.receiving, fusion.plating.delivery,
fusion.plating.pickup.request) now derive names as PFX-<parent>
with -NN suffix from the 2nd onward.

fusion.plating.pickup.request gains a sale_order_id field
(optional) so pickups created against an SO get parent-derived
names, while standalone pickups (pre-SO) fall back to PU/YYYY/NNNN.

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

fusion_plating/fusion_plating_receiving/models/fp_receiving.py

@@ -16,7 +16,7 @@ class FpReceiving(models.Model):
     """
     _name = 'fp.receiving'
     _description = 'Fusion Plating — Receiving'
-    _inherit = ['mail.thread', 'mail.activity.mixin']
+    _inherit = ['mail.thread', 'mail.activity.mixin', 'fp.parent.numbered.mixin']
     _order = 'received_date desc, id desc'
 
     name = fields.Char(string='Reference', readonly=True, copy=False, default='New')
@@ -97,19 +97,38 @@ class FpReceiving(models.Model):
             rec.unresolved_damage_count = len(rec.damage_ids.filtered(lambda d: not d.resolved))
 
     # -------------------------------------------------------------------------
-    # Sequence
+    # Sequence + parent-derived naming
     # -------------------------------------------------------------------------
+    def _fp_parent_sale_order(self):
+        return self.sale_order_id
+
+    def _fp_name_prefix(self):
+        return 'RCV'
+
+    def _fp_parent_counter_field(self):
+        return 'x_fc_pn_receiving_count'
+
     @api.model_create_multi
     def create(self, vals_list):
         for vals in vals_list:
-            if vals.get('name', 'New') == 'New':
-                vals['name'] = self.env['ir.sequence'].next_by_code('fp.receiving') or 'New'
             # Prefill received_qty from expected_qty so the operator only
-            # types when the count is wrong (the common case is "all
-            # arrived"). Saves a step on every routine receipt.
+            # types when the count is wrong.
             if vals.get('expected_qty') and not vals.get('received_qty'):
                 vals['received_qty'] = vals['expected_qty']
-        return super().create(vals_list)
+            if not vals.get('name'):
+                vals['name'] = 'New'
+        records = super().create(vals_list)
+        for rec in records:
+            if rec.name and rec.name != 'New':
+                continue
+            if not rec._fp_assign_parent_name():
+                seq = self.env['ir.sequence'].next_by_code('fp.receiving') or 'New'
+                self.env.cr.execute(
+                    "UPDATE fp_receiving SET name = %s WHERE id = %s",
+                    (seq, rec.id),
+                )
+                rec.invalidate_recordset(['name'])
+        return records
 
     # -------------------------------------------------------------------------
     # Sub 8 — box-count-only actions (new primary flow)