Missing writable entity/service for Leaf Offset with AI Controller

[0neiro]

Describe the bug
Home Assistant cannot expose or write the AI+ Controller’s VPD Leaf Temperature Offset (Leaf Offset) value. The setting is writable via my iOS app/cloud, but there is no corresponding writable entity/service in Home Assistant, so the value cannot be set from HA.

To Reproduce
Steps to reproduce the behavior:

1. Add/configure the AI+ Controller integration in Home Assistant (Controller Settings: "Sensors and Settings"): no Leaf Offset entity exists.
2. There is no writable entity (e.g., number) and no service to set Leaf Offset from HA.
3. In my iOS app, set Leaf Offset (e.g., -2) is possible.

Expected behavior
Home Assistant should expose Leaf Offset as a writable entity (likely a number) and/or provide a supported service to set it, consistent with the controller capability available via my iOS app.

Desktop (please complete the following information):

• OS: macOS (latest)

Smartphone (please complete the following information):

• Device: iPhone 17 Pro
• OS: iOS latest
• Browser: Safari latest

Additional context

• I found that Leaf Offset / VPD leaf offset handling was explicitly added in the past (issue_57), so I expected it to be exposed/writable from Home Assistant.