v1.7.0 - Module split, Dependabot, Diagnostics

Module split (no behaviour change)

The four largest source files are split into single-responsibility modules:

• _auth.py (206 lines) — the 5-step authentication flow as free functions operating on a session and a small AuthState bag.
• _redirects.py (99 lines) — manual redirect resolution, including the same-origin and HTTPS-only enforcement (CVE-2018-18074-class protection).
• _sensor_descriptions.py (96 lines) — the 12 sensor entity descriptions, with a small helper to deduplicate the m³ / litres totals.
• diagnostics.py (51 lines) — Home Assistant "Download diagnostics" support, with username, contract number and password redacted.

File-size impact:

File	Before	After
api.py	297	146
_http.py	237	151
sensor.py	173	64
statistics.py (orchestrator function)	~95 lines	~38 lines

No file in the integration now exceeds 210 lines.

New: Diagnostics

A "Download diagnostics" button is now available on the integration page (Settings → Devices & Services). It produces a sanitized JSON dump with the integration version, coordinator state, last error, and current sensor data — with credentials redacted. Useful when reporting bugs.

Maintenance: Dependabot

Weekly bumps for GitHub Actions and pip test dependencies, grouped to keep the PR noise low.

Quality scale

Gold rule diagnostics: done. (Silver remains the declared scale until more Gold rules are met.)

Robustness

• Defensive parsing on ConsumptionData: a missing volumeConsoEnM3 in any monthly entry no longer crashes the year-total computation.

No user-facing change. Update via HACS as usual.