Update configuration and documentation for LLM support and local watchdog

- Added `ollama-models.yaml` to .gitignore and implemented logic to copy it in gpu-rent.ps1 and gpu-rent.sh.
- Enhanced env.example to include new variables for LLM runtime options and local watchdog configuration.
- Updated CLI commands to support LLM options during setup and execution, including new flags for Ollama and llama.cpp.
- Improved documentation in cli.md and README.md to reflect changes in LLM integration and local watchdog functionality.
- Adjusted architecture and decisions documentation to clarify the role of LLMs and local watchdog in the system.

src/gpu_rent/paths.py

@@ -2,11 +2,15 @@
 
 from __future__ import annotations
 
+import os
 import shutil
 from pathlib import Path
 
 
 def detect_app_root() -> Path:
+    override = (os.environ.get("GPU_RENT_ROOT") or "").strip()
+    if override:
+        return Path(override).expanduser().resolve()
     cwd = Path.cwd().resolve()
     for candidate in (cwd, *cwd.parents):
         if (candidate / "Models").is_dir() and (candidate / "docs").is_dir():
@@ -23,6 +27,14 @@ def runtime_dir() -> Path:
     return app_root() / ".gpu-rent"
 
 
+def local_lease_path() -> Path:
+    return runtime_dir() / "local-lease.json"
+
+
+def local_watchdog_marker_path() -> Path:
+    return runtime_dir() / "local-watchdog.json"
+
+
 # Back-compat alias used across the package.
 def home_dir() -> Path:
     return runtime_dir()
@@ -36,6 +48,14 @@ def models_manifest_path() -> Path:
     return app_root() / "models.yaml"
 
 
+def ollama_models_manifest_path() -> Path:
+    return app_root() / "ollama-models.yaml"
+
+
+def ollama_models_example_path() -> Path:
+    return app_root() / "ollama-models.example.yaml"
+
+
 def extensions_manifest_path() -> Path:
     return app_root() / "extensions.yaml"