UX-13 P0: layout table, page<->options derivation, warning tier, entity list

The foundation for the new settings page. No visible UI change.

- app/uilayout.py: screen -> group -> part -> field for every option in
  config.yaml (67 fields, 11 derived, 0 hidden), with control, unit, display
  scale, step, entity kind, show conditions, Simple/wizard placement and
  "applies after a restart". Ranges stay in the schema, words in
  translations and the new app/ui_text/en.json.
- app/uimodel.py: options_to_ui()/ui_to_options() for the derived keys (one
  inverter vs the list, solar rows, static_profile from simple prices, a
  year-stamped region preset for the levies figure, and an OPT-11 hook for
  arbitrage_enabled that changes nothing yet). Unchanged derivations write
  the stored values back, so the round trip is exact.
- validate.py: validate.Note, a warn/info tier. Each logged warning is also
  a note when a list is passed; config_notes() adds checks that need live
  data (missing entity, a kW sensor read as W, a limit below this month's
  peak). /config/validate returns them as "notes". No refusal changed: 261
  recorded validator calls, 0 differ (tools/ux13_validator_calls.py).
- GET ha/entities: Home Assistant's entity list for the picker, read through
  hass.states(), cached 30 s, 10 s timeout. When HA is down it answers 200
  with the old list marked old, or an empty list that says why.
- DECISIONS/UX-13-one-layout-table.md amends UX-02's "no option key in UI
  code": keys may appear in uilayout.py and uimodel.py only, both tested.
- Tests: test_uilayout, test_uimodel (round trip over the recorded calls,
  the TEST-23 option files and config.yaml defaults), test_haentities, a
  warning-tier part in test_validate; test_messages scans notes and
  ui_text; test_pv and test_selfconfig part 7 widened on purpose.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LyR88rXETvwhTgx6yHE39p

goodwe_controller/app/messages.py

@@ -1099,6 +1099,18 @@ LABELS = {
     "unit_sign_disagree_w": "Per-inverter wrong-direction threshold",
     "slew_w": "Largest change per cycle",
     "shadow_mode": "Shadow mode",
+    # UX-13: named by the settings page's warnings (validate.Note).
+    "integrator_max_w": "Catch-up limit",
+    "maintenance_discharge_w": "Draw-down rate",
+    "peak_cap_w": "Peak limit",
+    "peak_forecast_entity": "15-minute demand forecast entity",
+    "meter_entity": "Grid power entity",
+    "soc_entity": "Battery level entity",
+    "batt_entity": "Battery power entity",
+    "pv_entity": "Solar production entity",
+    "pv_entities": "Solar production entities, per inverter",
+    "p1_phase_import_entities": "Import entities per phase",
+    "p1_phase_export_entities": "Export entities per phase",
 }