feat(1P): add state_class measurement to External CT Power sensor

[SupermotoJerry]

Description

Adds state_class: "measurement" to the External CT Power sensor (register 172)
for single-phase hybrid inverters.

Without a state_class, Home Assistant doesn't record long-term statistics for this
sensor, so it can't be used in the Energy dashboard (e.g. via a Riemann sum integration)
or in statistics graphs. This matches the other power sensors that already got a
state_class in #116.

Changes relate to

• Docs
• Deye 3P LP
• Deye 3P HV
• Deye 1P LP
• Other

🤖 Generated with Claude Code

Summary by Sourcery

Bug Fixes:

• Enable Home Assistant long-term statistics for the single-phase hybrid inverter External CT Power sensor.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds Home Assistant's measurement state class to the single-phase hybrid inverter External CT Power sensor (register 172), allowing long-term statistics, statistics graphs, and Riemann-sum Energy dashboard integrations.

File-Level Changes

Change	Details	Files
Enable long-term statistics and Energy dashboard compatibility for the External CT Power sensor.	Set the sensor state class to measurement while preserving its existing power device class and scaling configuration.	pv_inverter/packages/deye_hybrid_1p/grid.yaml

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

Sourcery assessment

Approved.

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