feat(x1): enable ipu and add new applications

- Enabled `ipu.nix` in the x1 system configuration.
- Added `piper-tts`, `libcamera`, and `gnome-terminal` to the application list.

systems/x86_64-linux/x1/default.nix

@@ -4,7 +4,7 @@ with lib.metacfg;
 {
   imports = [
     ./hardware-configuration.nix
-    # ./ipu.nix
+    ./ipu.nix
   ];
 
   services.cratedocs-mcp.enable = true;
@@ -80,6 +80,7 @@ with lib.metacfg;
     attic-client
     ollama
     piper
+    piper-tts
     klavaro
     tipp10
     gtypist
@@ -89,6 +90,8 @@ with lib.metacfg;
     gemini-cli
     vscode
     uv
+    libcamera
+    gnome-terminal
     #    (vscode-with-extensions.override {
     #      vscodeExtensions = with vscode-extensions; [
     #        rooveterinaryinc.roo-cline