Add comprehensive PipeWire audio configuration with noise suppression

- Add modules/sound/pipewire.nix with full PipeWire stack
- Include RNNoise AI-powered noise suppression
- Add EasyEffects with pre-configured presets for mic and speakers
- Include multiple GUI applications (pavucontrol, helvum, qpwgraph, pwvucontrol)
- Add helper scripts: audio-setup, microphone-test, validate-audio
- Optimize for low-latency real-time audio processing
- Enable auto-start and desktop integration
- Remove duplicate PipeWire configs from hardware-co.nix and users/common.nix
- Import sound module through desktop/common.nix for all desktop machines

modules/sound/audio-desktop-integration.nix

@@ -0,0 +1,212 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}: {
+  # Desktop entries for quick audio management access
+  environment.etc = {
+    # Desktop entry for EasyEffects
+    "xdg/autostart/easyeffects.desktop".text = ''
+      [Desktop Entry]
+      Name=EasyEffects
+      Comment=Audio effects for PipeWire applications
+      Icon=easyeffects
+      Exec=easyeffects --gapplication-service
+      Terminal=false
+      Type=Application
+      Categories=AudioVideo;Audio;
+      StartupNotify=true
+      X-GNOME-Autostart-enabled=true
+    '';
+
+    # Custom desktop entry for audio control center
+    "applications/audio-control-center.desktop".text = ''
+      [Desktop Entry]
+      Version=1.0
+      Type=Application
+      Name=Audio Control Center
+      Comment=Centralized audio management
+      Icon=audio-volume-high
+      Categories=AudioVideo;Audio;Settings;
+      Keywords=audio;sound;volume;pipewire;pulseaudio;
+      StartupNotify=true
+      Terminal=false
+      Exec=sh -c 'if command -v easyeffects >/dev/null 2>&1; then easyeffects; elif command -v pavucontrol >/dev/null 2>&1; then pavucontrol; elif command -v pwvucontrol >/dev/null 2>&1; then pwvucontrol; else helvum; fi'
+    '';
+  };
+
+  # Create a script for easy audio management
+  environment.systemPackages = with pkgs; [
+    (writeShellScriptBin "audio-setup" ''
+      #!/bin/bash
+
+      echo "🎵 Audio Control Center"
+      echo "======================"
+      echo ""
+      echo "Available audio applications:"
+      echo ""
+
+      if command -v easyeffects >/dev/null 2>&1; then
+        echo "  1. EasyEffects - Audio effects and noise suppression"
+      fi
+
+      if command -v pavucontrol >/dev/null 2>&1; then
+        echo "  2. PulseAudio Volume Control - Volume and device management"
+      fi
+
+      if command -v pwvucontrol >/dev/null 2>&1; then
+        echo "  3. PipeWire Volume Control - Native PipeWire control"
+      fi
+
+      if command -v helvum >/dev/null 2>&1; then
+        echo "  4. Helvum - PipeWire patchbay"
+      fi
+
+      if command -v qpwgraph >/dev/null 2>&1; then
+        echo "  5. qpwgraph - Qt PipeWire graph manager"
+      fi
+
+      echo ""
+      echo "  🔧 Audio Tools:"
+      echo "     • pw-top - Monitor PipeWire performance"
+      echo "     • pw-dump - Inspect PipeWire objects"
+      echo "     • pw-metadata - View/set PipeWire metadata"
+      echo "     • wpctl - WirePlumber control utility"
+      echo ""
+
+      echo "Choose an option (1-5) or press Enter for EasyEffects:"
+      read -r choice
+
+      case $choice in
+        1|"")
+          if command -v easyeffects >/dev/null 2>&1; then
+            echo "Starting EasyEffects..."
+            easyeffects
+          else
+            echo "EasyEffects not found!"
+          fi
+          ;;
+        2)
+          if command -v pavucontrol >/dev/null 2>&1; then
+            echo "Starting PulseAudio Volume Control..."
+            pavucontrol
+          else
+            echo "pavucontrol not found!"
+          fi
+          ;;
+        3)
+          if command -v pwvucontrol >/dev/null 2>&1; then
+            echo "Starting PipeWire Volume Control..."
+            pwvucontrol
+          else
+            echo "pwvucontrol not found!"
+          fi
+          ;;
+        4)
+          if command -v helvum >/dev/null 2>&1; then
+            echo "Starting Helvum..."
+            helvum
+          else
+            echo "Helvum not found!"
+          fi
+          ;;
+        5)
+          if command -v qpwgraph >/dev/null 2>&1; then
+            echo "Starting qpwgraph..."
+            qpwgraph
+          else
+            echo "qpwgraph not found!"
+          fi
+          ;;
+        *)
+          echo "Invalid choice"
+          ;;
+      esac
+    '')
+
+    (writeShellScriptBin "microphone-test" ''
+      #!/bin/bash
+
+      echo "🎤 Microphone Test & Setup"
+      echo "=========================="
+      echo ""
+
+      # Check if PipeWire is running
+      if ! pgrep -x pipewire >/dev/null; then
+        echo "❌ PipeWire is not running!"
+        exit 1
+      fi
+
+      echo "✅ PipeWire is running"
+
+      # Check for RNNoise
+      if ls /nix/store/*/lib/ladspa/librnnoise_ladspa.so >/dev/null 2>&1; then
+        echo "✅ RNNoise plugin is available"
+      else
+        echo "⚠️  RNNoise plugin not found"
+      fi
+
+      # List audio sources
+      echo ""
+      echo "📺 Available audio sources:"
+      wpctl status | grep -A 20 "Audio Sources"
+
+      echo ""
+      echo "🔊 Available audio sinks:"
+      wpctl status | grep -A 20 "Audio Sinks"
+
+      echo ""
+      echo "Would you like to:"
+      echo "  1. Test microphone input"
+      echo "  2. Open EasyEffects for noise suppression setup"
+      echo "  3. Show detailed audio device information"
+      echo "  4. Monitor audio levels"
+      echo ""
+      read -p "Choose an option (1-4): " choice
+
+      case $choice in
+        1)
+          echo "Recording 5 seconds of audio for playback test..."
+          echo "Speak into your microphone now!"
+          if command -v arecord >/dev/null 2>&1 && command -v aplay >/dev/null 2>&1; then
+            arecord -d 5 -f cd /tmp/mic_test.wav && echo "Playing back recording..." && aplay /tmp/mic_test.wav
+            rm -f /tmp/mic_test.wav
+          else
+            echo "❌ ALSA utilities not available"
+          fi
+          ;;
+        2)
+          if command -v easyeffects >/dev/null 2>&1; then
+            echo "Opening EasyEffects..."
+            easyeffects &
+          else
+            echo "❌ EasyEffects not found"
+          fi
+          ;;
+        3)
+          echo ""
+          echo "🔍 Detailed audio information:"
+          echo ""
+          pw-dump | jq '.[] | select(.info.props."media.class" == "Audio/Source" or .info.props."media.class" == "Audio/Sink") | {id: .id, name: .info.props."node.name", description: .info.props."node.description", class: .info.props."media.class"}'
+          ;;
+        4)
+          echo "Monitoring audio levels (Ctrl+C to stop)..."
+          if command -v pw-top >/dev/null 2>&1; then
+            pw-top
+          else
+            echo "Monitoring with wpctl..."
+            while true; do
+              clear
+              wpctl status
+              sleep 2
+            done
+          fi
+          ;;
+        *)
+          echo "Invalid choice"
+          ;;
+      esac
+    '')
+  ];
+}