Refactor LLM configuration to remove llamacpp support

- Removed references to llamacpp from configuration files, scripts, and documentation, streamlining the LLM setup process to focus solely on Ollama.
- Updated environment variables and paths to eliminate llamacpp-related entries, ensuring clarity in the configuration.
- Adjusted CLI commands and help messages to reflect the removal of llamacpp, enhancing user experience and reducing confusion.
- Revised documentation to provide clear guidance on using Ollama exclusively, including updates to setup instructions and runtime options.

src/gpu_rent/tunnel.py

@@ -79,8 +79,6 @@ def tunnel_forwards(cfg: Config) -> list[tuple[int, int]]:
     runtime = normalize_runtime(cfg.llm_runtime)
     if runtime == "ollama":
         pairs.append((cfg.ollama_local_port, 11434))
-    elif runtime == "llamacpp":
-        pairs.append((cfg.llamacpp_local_port, 8080))
     if not pairs:
         # Failsafe: at least SwarmUI port so tunnel isn't empty.
         pairs.append((cfg.swarmui_local_port, 7801))
@@ -189,8 +187,6 @@ def run_tunnel(
         open_url = f"http://127.0.0.1:{cfg.swarmui_local_port}"
     elif runtime == "ollama":
         open_url = f"http://127.0.0.1:{cfg.ollama_local_port}"
-    elif runtime == "llamacpp":
-        open_url = f"http://127.0.0.1:{cfg.llamacpp_local_port}"
     else:
         open_url = f"http://127.0.0.1:{cfg.swarmui_local_port}"