first commit

src/gpu_rent/paths.py

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+"""Paths: ~/.gpu-rent, app tree, SSH key."""
+
+from __future__ import annotations
+
+from pathlib import Path
+
+
+def home_dir() -> Path:
+    return Path.home() / ".gpu-rent"
+
+
+def env_path() -> Path:
+    return home_dir() / ".env"
+
+
+def state_path() -> Path:
+    return home_dir() / "state.json"
+
+
+def lock_path() -> Path:
+    return home_dir() / "gpu-rent.lock"
+
+
+def default_ssh_key_path() -> Path:
+    return home_dir() / "id_ed25519"
+
+
+def detect_app_root() -> Path:
+    cwd = Path.cwd().resolve()
+    for candidate in (cwd, *cwd.parents):
+        if (candidate / "Models").is_dir() and (candidate / "docs").is_dir():
+            return candidate
+    return cwd