refactor: moved nixos modules to dendrite pattern

modules/nixos/programs/wyoming.nix

@@ -0,0 +1,65 @@
+{...}: {
+  flake.nixosModules.wyoming = {
+    lib,
+    config,
+    ...
+  }: {
+    options.services.wyoming.enable = lib.mkEnableOption "should wyoming be enabled on this device";
+    config = lib.mkIf config.services.wyoming.enable (lib.mkMerge [
+      {
+        services.wyoming = {
+          # Text to speech
+          piper = {
+            servers = {
+              "en" = {
+                enable = true;
+                # see https://github.com/rhasspy/rhasspy3/blob/master/programs/tts/piper/script/download.py
+                voice = "en-us-amy-low";
+                uri = "tcp://0.0.0.0:10200";
+                speaker = 0;
+              };
+            };
+          };
+
+          # Speech to text
+          faster-whisper = {
+            servers = {
+              "en" = {
+                enable = true;
+                # see https://github.com/rhasspy/rhasspy3/blob/master/programs/asr/faster-whisper/script/download.py
+                model = "tiny-int8";
+                language = "en";
+                uri = "tcp://0.0.0.0:10300";
+                device = "cpu";
+              };
+            };
+          };
+
+          openwakeword = {
+            enable = true;
+            uri = "tcp://0.0.0.0:10400";
+            # preloadModels = [
+            #   "ok_nabu"
+            # ];
+            # TODO: custom models
+          };
+        };
+
+        # needs access to /proc/cpuinfo
+        systemd.services."wyoming-faster-whisper-en".serviceConfig.ProcSubset = lib.mkForce "all";
+      }
+      (lib.mkIf config.host.impermanence.enable {
+        environment.persistence."/persist/replicate/system/root" = {
+          enable = true;
+          hideMounts = true;
+          directories = [
+            {
+              directory = "/var/lib/private/wyoming";
+              mode = "0700";
+            }
+          ];
+        };
+      })
+    ]);
+  };
+}