fix: convert Uint8Array to Buffer in _bufferToFloat32

LiveKit SDK returns audio data as Uint8Array/ArrayBuffer, not Node.js Buffer.
Added Buffer.from() conversion before readInt16LE operations.

Fixes: TypeError: buffer.readInt16LE is not a function
Permet à l'audio reçu des clients d'être converti en Float32 pour lecture.

server/bridge/AudioBridge.js

@@ -578,6 +578,11 @@ export class AudioBridge extends EventEmitter {
    * @private
    */
   _bufferToFloat32(buffer) {
+    // Convertir en Buffer Node.js si c'est un Uint8Array ou ArrayBuffer
+    if (!(buffer instanceof Buffer)) {
+      buffer = Buffer.from(buffer);
+    }
+
     const samples = buffer.length / 2; // 2 bytes per sample (16-bit)
     const float32 = this._acquireFloat32Buffer(samples);