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/remote/idle_killer.py

@@ -107,7 +107,7 @@ def swarm_busy(swarm_url: str, timeout: float = 8.0) -> tuple[bool, str]:
 
 
 def llm_busy(timeout: float = 3.0) -> tuple[bool, str]:
-    """Ollama pull / loaded models or llama.cpp with a model count as busy."""
+    """Ollama pull / loaded models count as busy."""
     pull_marker = DATA / ".gpu-rent-ollama-pulling"
     if pull_marker.is_file():
         try:
@@ -138,24 +138,6 @@ def llm_busy(timeout: float = 3.0) -> tuple[bool, str]:
             return True, f"ollama running {names}"
     except (urllib.error.URLError, urllib.error.HTTPError, TimeoutError, json.JSONDecodeError, OSError):
         pass
-    # llama.cpp: slots in use
-    try:
-        req = urllib.request.Request("http://127.0.0.1:8080/health", method="GET")
-        with urllib.request.urlopen(req, timeout=timeout, context=ctx) as resp:
-            if getattr(resp, "status", 200) == 200:
-                try:
-                    req2 = urllib.request.Request("http://127.0.0.1:8080/props", method="GET")
-                    with urllib.request.urlopen(req2, timeout=timeout, context=ctx) as resp2:
-                        props = json.loads(resp2.read().decode("utf-8"))
-                    total = int(props.get("total_slots") or 0)
-                    avail = int(props.get("available_slots") or total)
-                    in_use = total - avail if total else 0
-                    if in_use > 0:
-                        return True, f"llamacpp slots_in_use={in_use}"
-                except Exception:
-                    pass
-    except (urllib.error.URLError, urllib.error.HTTPError, TimeoutError, OSError):
-        pass
     return False, "llm idle"