feat v1.12.0: Quality Scale conformance (phases 7-8)

- entry.runtime_data (HouseplanData in store.py) instead of hass.data; WS answers
  not_ready without a loaded entry
- test-before-setup (ConfigEntryNotReady), async_unload_entry, async_remove_entry
  (Lovelace resource cleanup), single_config_entry in manifest
- Store minor_version + migration hook; diagnostics.py (redacted); repairs
  (broken_plan issues, en/ru); system_health.py; strings.json
- quality_scale.yaml self-assessment; HA-harness tests (config flow, WS, upload)
  in CI on py3.13; CI backend job updated

tests_backend/test_ha_setup.py

@@ -0,0 +1,28 @@
+"""Entry setup/unload tests (CI)."""
+from homeassistant.core import HomeAssistant
+from pytest_homeassistant_custom_component.common import MockConfigEntry
+
+from custom_components.houseplan.const import DOMAIN
+
+
+async def _setup(hass: HomeAssistant) -> MockConfigEntry:
+    entry = MockConfigEntry(domain=DOMAIN, title="House Plan", data={}, options={})
+    entry.add_to_hass(hass)
+    assert await hass.config_entries.async_setup(entry.entry_id)
+    await hass.async_block_till_done()
+    return entry
+
+
+async def test_setup_creates_runtime_data(hass: HomeAssistant) -> None:
+    entry = await _setup(hass)
+    assert entry.state.value == "loaded"
+    assert entry.runtime_data is not None
+    assert entry.runtime_data.store is not None
+    assert entry.runtime_data.config_store is not None
+
+
+async def test_unload(hass: HomeAssistant) -> None:
+    entry = await _setup(hass)
+    assert await hass.config_entries.async_unload(entry.entry_id)
+    await hass.async_block_till_done()
+    assert entry.state.value == "not_loaded"