Improve frame pacing and RGBW LED output

[Funkelfetisch]

Summary

• add scheduler frame pacing with a configurable FPS cap and staggered housekeeping
• avoid frequent LittleFS usage scans from File Manager
• make ESP32 RMT LED output non-blocking, use DMA when available, and expose backend/frame-skip telemetry
• add RGB/RGBW color-order presets, SK6812 timing selection, and correction/encoder coverage

Validation

• git diff --check origin/main..HEAD
• moondeck/check/check_specs.py
• moondeck/check/check_platform_boundary.py
• product-specific string scan on the PR diff
• moondeck/build/build_esp32.py --firmware esp32s3-n16r8
• esp32s3-n16r8 image: 0x17f4a0, 63% app partition free

Not Run

• Desktop CMake/ctest: CMake is not available in this shell

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