feat(fusion_plating_shopfloor): /fp/landing/kanban endpoint

Plan task P3.1. New JSON-RPC endpoint for the Shop Floor Landing
client action (Phase 3). Two modes:

  station    — paired WC + Unassigned + next 1-2 WCs in recipe flow
  all_plant  — every active WC, recipe-flow order (replaces the data
               path for the standalone fp_plant_overview action)

Returns {columns: [{work_center_id, work_center_name, cards}], kpis:
{ready, running, bakes_due, holds}, stations: [...], facility_name,
server_time}. Card payload matches the KanbanCard OWL component
(P1.7) — same shape, no client-side adapter needed.

Light implementation — no urgency scoring or batch prefetch yet.
Both can be ported from plant_overview if performance demands.

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

fusion_plating/fusion_plating_shopfloor/tests/__init__.py

@@ -1,2 +1,3 @@
 # -*- coding: utf-8 -*-
 from . import test_workspace_controller
+from . import test_landing_kanban

fusion_plating/fusion_plating_shopfloor/tests/test_landing_kanban.py

@@ -0,0 +1,41 @@
+# -*- coding: utf-8 -*-
+# Copyright 2026 Nexa Systems Inc. — License OPL-1
+"""Plan task P3.1 — /fp/landing/kanban endpoint."""
+import json
+
+from odoo.tests.common import HttpCase, tagged
+
+
+def _rpc(case, url, **params):
+    res = case.url_open(
+        url,
+        data=json.dumps({'jsonrpc': '2.0', 'params': params}),
+        headers={'Content-Type': 'application/json'},
+    )
+    return res.json()['result']
+
+
+@tagged('-at_install', 'post_install', 'fp_shopfloor')
+class TestLandingKanban(HttpCase):
+
+    def setUp(self):
+        super().setUp()
+        self.authenticate("admin", "admin")
+
+    def test_all_plant_returns_columns_and_kpis(self):
+        res = _rpc(self, '/fp/landing/kanban', mode='all_plant')
+        self.assertTrue(res['ok'])
+        self.assertEqual(res['mode'], 'all_plant')
+        self.assertIn('columns', res)
+        self.assertIn('kpis', res)
+        for kpi in ('ready', 'running', 'bakes_due', 'holds'):
+            self.assertIn(kpi, res['kpis'])
+        self.assertIn('stations', res)
+
+    def test_station_mode_with_invalid_id_falls_back_to_all_plant_shape(self):
+        # No real station paired → station resolution returns None, but
+        # endpoint still produces a valid columns/kpis payload.
+        res = _rpc(self, '/fp/landing/kanban', mode='station', station_id=999999)
+        self.assertTrue(res['ok'])
+        self.assertIsNone(res['station'])
+        self.assertIn('columns', res)