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

custom_components/houseplan/http_api.py

@@ -18,7 +18,8 @@ except ImportError:  # older HA versions
     KEY_HASS = "hass"  # type: ignore[assignment]
 from homeassistant.core import HomeAssistant
 
-from .const import CONF_ADMIN_ONLY, DOMAIN, FILES_DIR, FILES_URL
+from .const import CONF_ADMIN_ONLY, FILES_DIR, FILES_URL
+from .store import get_entry
 from .validation import (
     FILE_EXTENSIONS,
     MAX_FILE_BYTES,
@@ -41,7 +42,7 @@ class HouseplanUploadView(HomeAssistantView):
 
     async def post(self, request: web.Request) -> web.Response:
         hass: HomeAssistant = request.app[KEY_HASS]
-        entry = hass.data.get(DOMAIN, {}).get("entry")
+        entry = get_entry(hass)
         admin_only = bool(entry and entry.options.get(CONF_ADMIN_ONLY, False))
         if admin_only:
             user = request.get("hass_user")