Add dev tools in Ansible and update Zed model config

- Split Ubuntu/Debian package installation with apt conditional
- Include clang, cmake, ninja-build and other development packages
- Switch Zed default AI model to Google Gemini 2.5 via OpenRouter

zed/settings.json

@@ -74,8 +74,8 @@
     "default_profile": "write",
     "model_parameters": [],
     "default_model": {
-      "provider": "zed.dev",
-      "model": "claude-sonnet-4"
+      "provider": "openrouter",
+      "model": "google/gemini-2.5-flash"
     }
   },
   "edit_predictions": {