Fix produce-box select cancelling config entry setup

async_added_to_hass listed the switchable boxes inline, one fetch per box
popup, so on a slower connection the platform setup ran past
SLOW_SETUP_MAX_WAIT and the whole config entry was cancelled into
setup_error — every entity unavailable despite valid credentials. Move the
listing to a background task so setup never blocks on it; the options fill in
once it returns.

Also bound every portal request to a 30s timeout so one hung request can no
longer drag a refresh, or a first setup, past Home Assistant's own limits and
fail it outright.

Regression covered in tests/test_setup_hygiene.py.

custom_components/freshharvest/todo.py

@@ -39,7 +39,7 @@ from homeassistant.exceptions import HomeAssistantError
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 
 from . import FreshHarvestConfigEntry
-from .api import FreshHarvestError
+from .api import REQUEST_TIMEOUT, FreshHarvestError
 from .coordinator import FreshHarvestCoordinator
 from .entity import FreshHarvestEntity
 
@@ -129,6 +129,7 @@ class FreshHarvestBox(FreshHarvestEntity, TodoListEntity):
                 "X-Algolia-Application-Id": app,
                 "Content-Type": "application/json",
             },
+            timeout=REQUEST_TIMEOUT,
         ) as resp:
             resp.raise_for_status()
             hits = (await resp.json()).get("hits") or []