FastAPI skeleton: health, OpenAPI, core wiring (task 042dfc5c)

FastAPI skeleton: health, OpenAPI, core wiring (task 042dfc5c)

api/__init__.py

@@ -0,0 +1,19 @@
+"""NestQuest API service.
+
+A standalone FastAPI deployable that owns the NestQuest database and
+exposes it over HTTP to the Home Assistant integration (panel plane) and
+the admin PWA (admin plane).  See Feature 16 (task cd03735b) in the
+project tracker for the full contract.
+
+This package imports the NestQuest domain ``core`` WITHOUT executing
+``custom_components/nestquest/__init__.py`` — that parent package's
+``__init__.py`` imports ``homeassistant``, which is absent from the
+API's runtime.  The coupling is encapsulated in
+:mod:`api.nestquest_core`, which loads ``core`` by file location with
+:mod:`importlib.util` and registers it under the distinct top-level name
+``nestquest_core`` (no ``sys.path`` mutation, no generic top-level
+names published).  It is a TRANSITIONAL coupling that Feature 18 will
+revisit: once the integration becomes a thin API client and ``core``
+moves out of the integration bundle, this helper goes away.
+"""
+from __future__ import annotations