Core: Implement basic Web Server for ON/OFF commands

[zluuba]

We need to establish the project foundation with two main components:

Core Logic

Manage 6 LED matrices with flexible rotation and positioning (simplify hardware integration), handle math transformations and low-level hardware communication

Web Server

Backend: Lightweight web server
Frontend: Simplest web interface (html, two btns)

One requirement: two control buttons (ON/OFF) with the following endpoints:

• Main page: http://cube/ (configure mDNS)
• ON mode: http://cube/on (turn all LEDs on at 30% brightness - temporary setting until light diffuser installation)
• OFF mode: http://cube/off (turn all LEDs off)

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Implementation Priority

Phase 1 (ASAP): Minimal web server with ON/OFF functionality
Phase 2: Core matrix management system with rotation/positioning
Phase 3: Integration between server and hardware layers

Note: The 30% brightness is a temporary workaround until we install proper light diffusers on the cube