fix: improve voice quality and add distortion troubleshooting

- Fix RNNoise configuration: use mono instead of stereo, increase VAD threshold to 95%
- Adjust quantum settings: increase min-quantum to 64 for stability
- Add comprehensive voice distortion troubleshoot script
- Create optional disable-auto-rnnoise.nix for problematic setups
- The automatic RNNoise filter can cause artifacts, script helps diagnose and fix

modules/sound/disable-auto-rnnoise.nix

@@ -0,0 +1,25 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}: {
+  # Optional configuration to disable automatic RNNoise filter
+  # This can be imported if the automatic filter causes distortion
+  
+  services.pipewire = {
+    extraConfig.pipewire."15-disable-auto-rnnoise" = {
+      "context.modules" = [
+        # Commenting out the automatic RNNoise filter
+        # Users should use EasyEffects for manual noise suppression instead
+        # {
+        #   name = "libpipewire-module-filter-chain";
+        #   args = {
+        #     "node.description" = "Noise Canceling Source";
+        #     # ... rest of RNNoise config
+        #   };
+        # }
+      ];
+    };
+  };
+}