Add support for Home Assistant voice (whisper + piper + cloud llm) and Music Assistant via Spotify by librespot

Music assistant has custom modifications they made to librespot that they haven't bothered to even try to upstream.
Thus, they require a custom librespot.  I tried and tried and tried and tried to just override the one already in nixpkgs
but I had trouble doing so despite copying the pattern already shown in nixpkgs for overriding the src of a cargo pkg
(See mopidy) but it just didn't work... Oh well. So I just patch nixpkgs instead with the new source. It works I guess.

This is about where I gave up...

```nix
nixpkgs.overlays = [
  (final: prev: {
    # Cannot use librespot upstream because music-assistant requires custom changes
    # that they never bothered to even try to uptream
    librespot = prev.librespot.overrideAttrs (oldAttrs: rec {
      src = prev.fetchFromGitHub {
        owner = "music-assistant";
        repo = "librespot";
        rev = "786cc46199e583f304a84c786acb0a9b37bc3fbd";
        sha256 = "sha256-xaOrqC8yCjF23Tz31RD3CzqZ3xxrDM6ncW1yoovEaGQ=";
      };

      cargoDeps = oldAttrs.cargoDeps.overrideAttrs (oldAttrs': {
        vendorStaging = oldAttrs'.vendorStaging.overrideAttrs {
          outputHash = "sha256-SqvJSHkyd1IicT6c4pE96dBJNNodULhpyG14HRGVWCk=";
        };
      });
    });
  })
];
```

machines/storage/s0/default.nix

@@ -237,7 +237,7 @@
             globalRedirect = "s0.neet.dev";
           };
         }
-        (mkVirtualHost "ha.s0.neet.dev" "http://localhost:8123") # home assistant
+        (mkVirtualHost "ha.s0.neet.dev" "http://localhost:${toString config.services.home-assistant.config.http.server_port}")
         (mkVirtualHost "esphome.s0.neet.dev" "http://localhost:6052")
         (mkVirtualHost "zigbee.s0.neet.dev" "http://localhost:55834")
         {

machines/storage/s0/home-automation.nix

@@ -15,7 +15,14 @@
     ];
   };
   networking.firewall.allowedTCPPorts = [
-    1883 # mqtt
+    # mqtt
+    1883
+
+    # Must be exposed so some local devices (such as HA voice preview) can pair with home assistant
+    config.services.home-assistant.config.http.server_port
+
+    # Music assistant (must be exposed so local devices can fetch the audio stream from it)
+    8097
   ];
 
   services.zigbee2mqtt = {
@@ -75,12 +82,23 @@
       "homekit_controller"
       "zha"
       "bluetooth"
+      "whisper"
+      "piper"
+      "wyoming"
+      "tts"
+      "music_assistant"
+      "openai_conversation"
     ];
     config = {
       # Includes dependencies for a basic setup
       # https://www.home-assistant.io/integrations/default_config/
       default_config = { };
 
+      homeassistant = {
+        external_url = "https://ha.s0.neet.dev";
+        internal_url = "http://192.168.1.2:${toString config.services.home-assistant.config.http.server_port}";
+      };
+
       # Enable reverse proxy support
       http = {
         use_x_forwarded_for = true;
@@ -105,4 +123,28 @@
       };
     };
   };
+
+  services.wyoming.faster-whisper.servers."hass" = {
+    enable = true;
+    uri = "tcp://0.0.0.0:45785";
+    model = "distil-small.en";
+    language = "en";
+  };
+
+  services.wyoming.piper.servers."hass" = {
+    enable = true;
+    uri = "tcp://0.0.0.0:45786";
+    voice = "en_US-joe-medium";
+  };
+
+  services.music-assistant = {
+    enable = true;
+    providers = [
+      "hass"
+      "hass_players"
+      "jellyfin"
+      "radiobrowser"
+      "spotify"
+    ];
+  };
 }