feat: initial Reaktor modular synth app

React + Tone.js modular synthesizer with visual node editor.
Includes: Oscillator, Filter, Envelope, LFO, VCA, Delay, Reverb,
Distortion, Mixer, Scope, Output, and Keyboard modules.
SVG wire connections, knob controls, preset save/load system.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

public/favicon.svg

@@ -0,0 +1,8 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 32 32">
+  <rect width="32" height="32" rx="4" fill="#0a0a14"/>
+  <circle cx="10" cy="16" r="3" fill="#00e5ff" opacity="0.9"/>
+  <circle cx="22" cy="10" r="3" fill="#ff6644" opacity="0.9"/>
+  <circle cx="22" cy="22" r="3" fill="#44ff88" opacity="0.9"/>
+  <line x1="13" y1="16" x2="19" y2="10" stroke="#00e5ff" stroke-width="1.5" opacity="0.6"/>
+  <line x1="13" y1="16" x2="19" y2="22" stroke="#00e5ff" stroke-width="1.5" opacity="0.6"/>
+</svg>