Build RhythmLume music-reactive Hue desktop app

[falkenbergo]

Summary

• replace the previous SDK sample workspace with an original .NET 8 WPF desktop application named RhythmLume
• add WASAPI system/microphone capture, overlapping FFT analysis, adaptive kick detection, live meters, and a spectrum visualizer
• add Hue mDNS/broker discovery, manual IP, physical pairing, DPAPI credentials, v1 compatibility output, and v2 Entertainment DTLS streaming
• add five audio-driven effects, eight presets, room positioning/order, palette and strobe-safety controls, diagnostics, troubleshooting, and Hue compatibility research

Verification

• dotnet build RhythmLume.sln --configuration Release — succeeded, 0 warnings and 0 errors
• dotnet test RhythmLume.sln --configuration Release --no-build — 10/10 passed
• dotnet format RhythmLume.sln --verify-no-changes --severity warn — passed
• dotnet publish src/RhythmLume.App/RhythmLume.App.csproj --configuration Release --no-build — passed
• transitive NuGet vulnerability audit — no known vulnerable packages

Hardware boundary

The Linux cloud host cross-compiled the WPF application but cannot launch WASAPI/WPF or access a physical bridge. Windows startup/audio capture, bridge certificate variants, Entertainment ownership/DTLS interoperability, lamp latency, gradient channels, and Bridge v1 firmware behavior are documented as requiring real Hue hardware verification.