Fixed battery check, added tested, show IP and cleaned code

[Bekkie]

Fixed: battery check, database field was not loaded for devices, therefore battery check was ignored

New: show server IP address on start up and on mDNS registration

Added: routes.py test set, which actually uses database (with mock data) and real http-server-calls

Cleaned a lot ruff warnings

[Copilot]

Pull request overview

This PR fixes device battery-state handling in the state manager, adds server IP reporting during startup/mDNS registration, and introduces a comprehensive routes.py integration-style test suite backed by a real SQLite test DB.

Changes:

• Include battery_state when loading device metadata so battery checks aren’t silently skipped.
• Add “primary IPv4” detection and expose/log the server IP on startup and mDNS registration; extend register_service_async to return the IP.
• Add a large FastAPI routes test suite using a temporary SQLite DB with mock API calls.

Reviewed changes

Copilot reviewed 6 out of 11 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
tests/test_zeroconf_register.py	Updates test to unpack the new register_service_async return shape.
tests/test_routes.py	Adds end-to-end-ish route tests using a real SQLite DB + FastAPI TestClient.
tado_local/zeroconf_register.py	Exposes get_primary_ipv4() and returns IP from mDNS registration.
tado_local/main.py	Logs API URLs using detected server IP; logs IP during mDNS registration.
tado_local/state.py	Ensures battery_state is included in device queries/caches.
tado_local/routes.py	Minor formatting-only change in the shown hunk.
tado_local/sync.py	Formatting-only whitespace cleanup in the shown hunk.
tado_local/api.py	Formatting-only whitespace cleanup in the shown hunk.
tado_local/homekit_uuids.py	Formatting-only change (no functional delta).
demos/zone-manager.py	Formatting-only whitespace cleanup in the shown hunks.
requirements-dev.txt	Adds pytest-httpx to dev requirements.

Comments suppressed due to low confidence (1)

tado_local/zeroconf_register.py:51

• register_service_async returns tuple of size 3 and tuple of size 4.
  register_service_async returns tuple of size 3 and tuple of size 4.

async def register_service_async(name: str = 'tado-local', port: int = 4407, props: Optional[Dict[str, str]] = None, service_type: Optional[str] = None, advertise_addr: Optional[str] = None):

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