Add Wired Doorbell Plus (2nd Gen) support - #539

Summary

• Recognize cocoa_doorbell_v4w devices as Wired Doorbell Plus (2nd Gen) doorbells.
• Enable ding, history, motion detection, pre-roll, video, and volume capabilities.
• Avoid exposing unsupported battery and knock capabilities.
• Add regression coverage for the new device mapping and capabilities.

Fixes #521

Testing

• uv run pre-commit run --files ring_doorbell/const.py ring_doorbell/doorbot.py tests/test_ring.py --verbose
• uv run pytest tests/ --force-enable-socket --cov=ring_doorbell --cov-report=xml --cov-report=term-missing --import-mode importlib
• uv run docs\make.bat html