chore(nix): add Wyoming service configuration

- Introduced a new `wyoming.nix` file with service definitions for `faster-whisper` and `piper`.
- Enabled TCP ports `10200` and `10300` in the firewall for service communication.
- Updated SGX configuration to include `wyoming.nix` in system imports.

systems/x86_64-linux/sgx/wyoming.nix

@@ -0,0 +1,23 @@
+{ ... }:
+{
+  services.wyoming = {
+    faster-whisper.servers."main" = {
+      enable = true;
+      language = "de";
+      model = "base"; # or "small"/"medium" for better accuracy
+      uri = "tcp://0.0.0.0:10300";
+      device = "cpu";
+    };
+
+    piper.servers."main" = {
+      enable = true;
+      voice = "de_DE-thorsten-medium"; # popular German voice
+      uri = "tcp://0.0.0.0:10200";
+    };
+  };
+
+  networking.firewall.allowedTCPPorts = [
+    10200
+    10300
+  ];
+}