Added Multicolor light handling

[marklynch]

Added

• Decoded CMD 0x3C as the Light Refresh Command, previously logged as unhandled: a touchscreen broadcast carrying a light zone index that refreshes/resyncs that zone's light, observed during light configuration sessions and color operations — handled log-only with out-of-range zone indexes recorded as "undocumented" entries on the Unknown Messages page; documented in PROTOCOL.md with the exact effect at the light hardware flagged unconfirmed
• Added light color control to the Home Assistant light entities for multicolor zones: each zone whose light is multicolor-capable (and whose system light type is known via register 0xF0) now exposes the model's color list — the SLX or Delta subset of the shared color table — as the light's effect list, with the current color shown as the active effect and color picks sent to the controller as a Gateway-sourced register write; light entity discovery re-publishes automatically if the light type or a zone's multicolor capability changes, and the MQTT light state now uses the canonical color names (e.g. "User 1" instead of "User1") so the reported color matches the effect list
• Decoded register 0xF0 (slot 0x01) as the system-wide Multicolor Light Type selection, previously an unknown register: the light model chosen in the touchscreen's light setup (0x00 = SLX, 0x01 = Delta, 0xFF = no multicolor light), confirmed by switching the type in the UI and watching the register rebroadcast. Surfaced as a "Multicolor Light Type" row on the status page and a multicolor_light_type field in the /status JSON ("None"/"SLX"/"Delta"); an unmapped model index is shown as "Unknown (0xXX)" and recorded as an "undocumented" entry on the Unknown Messages page — documented in PROTOCOL.md, where the selected model also determines which subset of the shared light color code table applies — the full SLX and Delta color code subsets were mapped by cycling every color on each type, and a Gateway-sourced 0x3A color write was verified working (sets the light and updates the touchscreen)