feat(fusion_plating): box-level tracking (fp.box) + thermal job-sticker redesign

Box registry: new fp.box model (fusion_plating_receiving), one record per
received box, auto-created when a receiving is marked Counted (idempotent
_fp_sync_boxes — grows/shrinks with box_count_in, never touches an advanced
box). Status received -> racked -> in_process -> packed -> shipped, per-box
scannable QR (/fp/box/<id> controller). Backfill migration for receivings
counted before tracking shipped. Boxes list/kanban/form + receiving smart
button.

Job stickers redesigned (thermal label, 6x4 in / 152x102mm, mm layout @
paperformat dpi=96 so mm maps 1:1 in wkhtmltopdf — see rule 14):
- Internal Job Sticker = Layout A, ONE per job (shop notes from
  x_fc_internal_description, job QR).
- External Job Sticker = Layout B, ONE per fp.box (BOX n/N, per-box QR,
  factory company logo, customer-facing notes). Dynamic MASK badge
  (x_fc_masking_enabled) + BAKE block (x_fc_bake_instructions), length-tiered
  notes font. Display logic in fp.job._fp_sticker_data().

Also retains the SO/WO box-sticker MemoryError fix in report_fp_wo_sticker.xml
(per-box loop sourced from fp.receiving.box_count_in + 100-label safety cap).

Verified live on entech: 111 boxes backfilled (31 receivings), External renders
one page per box, Internal one per job, scan endpoint 303->login.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

fusion_plating/fusion_plating_receiving/__manifest__.py

@@ -5,7 +5,7 @@
 
 {
     'name': 'Fusion Plating — Receiving & Inspection',
-    'version': '19.0.3.28.5',
+    'version': '19.0.3.29.1',
     'category': 'Manufacturing/Plating',
     'summary': 'Parts receiving, inspection, damage logging, and manufacturing gate.',
     'description': """
@@ -44,6 +44,7 @@ Provides:
         'views/fp_racking_inspection_views.xml',
         'views/sale_order_views.xml',
         'views/fp_receiving_menu.xml',
+        'views/fp_box_views.xml',
         'views/fusion_shipment_inherit_views.xml',
         'wizards/fp_label_manual_wizard_views.xml',
         'wizards/fp_label_generate_wizard_views.xml',