feat: implement RoborockDockState synthesis and RoborockChargeStatus enum

[allenporter]

The goal of this PR is to improve device status reporting. Today a device is considered "charging" even though it may not actually be charging yet due to waiting for some off peak time. This adds support for additional detail from charge_status to make it easier to interpret. This also adds a higher level enum based on behavior observed in the app of explaining the current dock state.

Adds a lot of documentation about what these new combined states mean.

home-assistant/core#169151

[Copilot]

Pull request overview

This PR improves Roborock V1 status reporting by introducing a richer charge_status enum and synthesizing a higher-level dock_state that better matches the Roborock app’s UI behavior (including off-peak charging waiting).

Changes:

• Add RoborockChargeStatus enum and type charge_status fields accordingly.
• Add synthesized dock_state property (based on state, charge_status, battery) and RoborockDockState enum for consumers.
• Update/extend tests and snapshots to reflect the new fields and behavior.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
roborock/data/v1/v1_code_mappings.py	Adds RoborockChargeStatus and RoborockDockState enums.
roborock/data/v1/v1_containers.py	Updates charge_status typing and introduces synthesized dock_state property.
tests/data/v1/test_v1_containers.py	Updates expectations for charge_status and adds dock-state parametrized tests.
tests/devices/__snapshots__/test_v1_device.ambr	Updates snapshot output to include synthesized dock_state.

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