feat(iot): Sub 7 — per-sensor polling interval + rate-limit + entech seed

Per-sensor override on fp.tank.sensor.poll_interval_minutes with a
company-wide default (res.company.x_fc_default_poll_interval_minutes,
default 30) exposed in Settings → Fusion Plating → IoT. Single
lookup helper _fp_effective_poll_interval_minutes keeps downstream
call sites simple. Read-only poll_interval_display Char ("30 min
(default)" / "15 min (override)") keeps units unambiguous per user
request.

Ingest endpoint /fp/iot/ingest drops readings that arrive inside a
sensor's effective interval, returning {accepted, skipped} so the Pi
agent can log it. Pi-side interval stays its own concern.

Post-init hook seeds 5 small tanks + 20 big tanks (10 active, 10
inactive) with 1 temperature + 1 pH sensor each → 25 tanks, 50
sensors. Idempotent (keyed by tank.code, with_context(active_test=
False)). Opt-in via ir.config_parameter
fusion_plating_iot.seed_entech_tanks = '1' so a fresh install
elsewhere doesn't auto-seed. Flag set on entech today; 27 tanks / 52
sensors now live (2 pilot + 25 seeded).

Smoke on entech: 14/14 assertions pass including idempotency and
rate-limit conditions.

fusion_plating_iot → 19.0.2.0.0

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

fusion_iot/fusion_plating_iot/__manifest__.py

@@ -5,7 +5,7 @@
 
 {
     'name': 'Fusion Plating — IoT Integration',
-    'version': '19.0.1.0.0',
+    'version': '19.0.2.0.0',
     'category': 'Manufacturing/Plating',
     'summary': 'Wire physical tank sensors to Fusion Plating — live '
                'temperature / chemistry readings with auto quality holds '
@@ -51,6 +51,7 @@ Part of the Fusion Plating product family by Nexa Systems Inc.
         'views/fp_tank_sensor_views.xml',
         'views/fp_tank_reading_views.xml',
         'views/fusion_plating_tank_views.xml',
+        'views/res_config_settings_views.xml',
         'views/fp_iot_menu.xml',
     ],
     'post_init_hook': 'post_init_hook',