feat(calls): implement advanced multi-model ML noise suppression system

Implement a flexible, multi-model noise suppression pipeline for Element Call/LiveKit integration:

- ML Engines: Added support for RNNoise, Speex, DTLN, and DeepFilterNet 3 models.
- Pipeline Architecture: Implemented modular audio processing in lotus-denoise.js, supporting 'Series Suppression' (running browser-native NSNet2 before ML) and a hardware-style Noise Gate.
- UI & UX Enhancements:
  - Settings UI: Added model comparison chart with CPU/Quality metadata.
  - Tuning: Added Live Microphone Meter for calibrating Noise Gate thresholds.
  - Reporting: Added LotusToast system to alert users when ML suppression fails or falls back to raw input.
- Robustness & Quality:
  - Capture Fidelity: Removed forced 48kHz capture constraints to allow native-rate capture (solving static issues with high-end audio interfaces).
  - Performance: Added WASM SIMD detection with transparent fallback.
  - Capability Detection: Added browser feature detection to disable unsupported ML modes.
- Build Integration: Updated Vite config to self-host all model WASM/tflite assets in /denoise/ directory.

vite.config.js

@@ -87,9 +87,40 @@ function lotusDenoise() {
         ],
         [path.join(sapphi, 'rnnoise.wasm'), path.join(denoiseDir, 'rnnoise.wasm')],
         [path.join(sapphi, 'rnnoise_simd.wasm'), path.join(denoiseDir, 'rnnoise_simd.wasm')],
+        [
+          path.join(sapphi, 'speex/workletProcessor.js'),
+          path.join(denoiseDir, 'speexWorklet.js'),
+        ],
+        [path.join(sapphi, 'speex.wasm'), path.join(denoiseDir, 'speex.wasm')],
+        [
+          path.join(sapphi, 'noiseGate/workletProcessor.js'),
+          path.join(denoiseDir, 'noiseGateWorklet.js'),
+        ],
+        // DTLN (WorkAdventure LiteRT implementation)
+        [
+          path.resolve('node_modules/@workadventure/noise-suppression/dist/noise-suppression-processor.js'),
+          path.join(denoiseDir, 'dtlnWorklet.js'),
+        ],
+        [
+          path.resolve('node_modules/@workadventure/noise-suppression/dist/litert_wasm_internal.wasm'),
+          path.join(denoiseDir, 'litert_wasm_internal.wasm'),
+        ],
+        [
+          path.resolve('node_modules/@workadventure/noise-suppression/dist/model_1.tflite'),
+          path.join(denoiseDir, 'model_1.tflite'),
+        ],
+        [
+          path.resolve('node_modules/@workadventure/noise-suppression/dist/model_2.tflite'),
+          path.join(denoiseDir, 'model_2.tflite'),
+        ],
       ];
       assets.forEach(([s, d]) => {
-        if (fs.existsSync(s)) fs.copyFileSync(s, d);
+        if (fs.existsSync(s)) {
+          fs.copyFileSync(s, d);
+        } else {
+          // eslint-disable-next-line no-console
+          console.warn(`[lotus-denoise] Asset missing, will be populated by CI: ${s}`);
+        }
       });
 
       const shimSrc = path.resolve('build/lotus-denoise.js');