Add Nanoleaf Essentials and HD lightstrip support

[Gbast0]

Summary

• Extend the Nanoleaf driver so Essentials/HD lightstrips work without panelLayout. LED count comes from GET /length, and IDs are 0..N-1.
• Keep the original panel path (Aurora/Canvas/Shapes) for devices that still report layout.
• Stream over the existing UDP v2 protocol, force device brightness to 100% for strips, and apply a candy-style saturation/midtone boost so TV colors stay punchy.

Test plan

• Add a Nanoleaf Essentials/HD strip (for example NL72K1) with host, token, and hardware LED count from /length
• Confirm the strip stays in extControl and colors look bright/saturated
• Confirm streaming remains stable at the smoothing frame rate
• Confirm an older panel device still initializes from panelLayout and streams as before