Update LLM support for llama.cpp and enhance configuration management

- Added support for `llamacpp-models.yaml` in `.gitignore` and implemented logic to copy it in `gpu-rent.ps1` and `gpu-rent.sh`.
- Enhanced CLI to prompt for llama.cpp model presets during setup and execution, improving user experience.
- Updated configuration handling to include `llamacpp_models_manifest` and related functions for managing llama.cpp models.
- Improved documentation in `cli.md` and `llm.md` to reflect changes in llama.cpp integration and model management.
- Refactored provisioning logic to handle llama.cpp model downloads and configurations effectively.

src/gpu_rent/paths.py

@@ -56,6 +56,14 @@ def ollama_models_example_path() -> Path:
     return app_root() / "ollama-models.example.yaml"
 
 
+def llamacpp_models_manifest_path() -> Path:
+    return app_root() / "llamacpp-models.yaml"
+
+
+def llamacpp_models_example_path() -> Path:
+    return app_root() / "llamacpp-models.example.yaml"
+
+
 def extensions_manifest_path() -> Path:
     return app_root() / "extensions.yaml"