The integration no longer owns a database

The HA integration is now purely a client of the NestQuest API service
(Feature 18): the API owns the SQLite file, the migrations, and every
business rule, so keeping a second copy of that ownership inside the
integration meant two sources of truth for household state, dead
wiring (the startup backfill, the day-rollover materialization and
sweep listeners, the corrupt-DB handling, the admin-allowlist seeding)
and settings keys nothing consumes any more.

Removed the integration's re-export/DB shim modules (db, store,
migrations, schema, the five DAOs, completion, children,
quest_definitions, admin_allowlist, presence, presence_management,
materialize, recurrence, events, sweep); the bundled domain package at
custom_components/nestquest/core/ is untouched and remains the single
home of those engines.  Setup now builds only the API client, the
snapshot coordinator, and the SSE subscription, registers the one
complete_quest proxy, and forwards the platforms.  The options flow
keeps only the keys the client itself consumes (API base URL + panel
token, update interval, staleness, panel idle timeout); the horizon,
rollover, notification and admin-allowlist settings moved out with the
database (the API's settings store owns horizon/rollover, and the
automations take their behaviour from blueprint inputs).  The
integration-plane tests now script the panel route's payloads and SSE
frames instead of seeding a local database; the core-plane tests keep
their coverage with imports pointed at core directly.

tests/test_config_flow.py

@@ -156,23 +156,13 @@ def test_no_hardcoded_domain_or_db_filename_in_new_modules() -> None:
                     f"Found hard-coded database filename in {py_file.name}:{node.lineno}"
                 )
 
-async def test_flow_persists_flow_user_as_initial_admin(hass, make_flow) -> None:
-    """The HA user completing the flow lands in entry data as the
-    initial admin copy: entry.context is not persisted by real HA, so
-    the durable record must carry the owner."""
-    from custom_components.nestquest.const import CONF_ADMIN_USER_IDS
-
-    flow = make_flow(hass)
-    flow.context = {"user_id": "ha-owner"}
-    result = await flow.async_step_user({})
-    assert result["type"] == "create_entry"
-    assert result["data"] == {CONF_ADMIN_USER_IDS: ["ha-owner"]}
-
-
 async def test_flow_without_context_user_keeps_data_untouched(
     hass, make_flow
 ) -> None:
+    """A submit with user input stores it as-is; no admin copy is
+    invented (the allowlist lives in the API service's own store since
+    the DB removal)."""
     flow = make_flow(hass)
-    result = await flow.async_step_user({"horizon_days": 7})
+    result = await flow.async_step_user({"update_interval": 60})
     assert result["type"] == "create_entry"
-    assert result["data"] == {"horizon_days": 7}
+    assert result["data"] == {"update_interval": 60}