feat(mcp): restore MCP service with display charging toggle
- Restore MCP system (McpSystem 1900+ LOC, McpHandler, McpScreensaver, McpSettings, McpOverride apps) - Use audio-stream instead of direct I2S for MP3 playback (fixes fast playback, uses native resampler) - Register McpSettings + McpOverride in Tactility.cpp so Settings shows MCP Screen - DisplaySettings: add ScreensaverType::McpScreen and disableScreensaverWhenCharging flag - Display app: add 'Disable on charging' toggle, handles McpScreen screensaver type - DisplayIdle: skip screensaver while charging, support McpScreen screensaver, isDeviceCharging check via PowerDevice - WebServer: coexistence with MCP (McpHandler) - Avoid formatting churn from previous commits Squashed from range eaa248b0..8970143f (6 commits) into single clean commit
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