fix: prevent Ollama config refresh resets

dashboard/plugin_api.py

@@ -262,8 +262,11 @@ FAMILY_STRENGTHS = {
 }
 
 
+_PLUGIN_HOME_ROOT = Path(os.environ.get("HERMES_HOME", "").strip()).expanduser().resolve() if os.environ.get("HERMES_HOME", "").strip() else Path(get_hermes_home()).resolve()
+
+
 def _home() -> Path:
-    path = get_hermes_home() / "ollama-manager"
+    path = _PLUGIN_HOME_ROOT / "ollama-manager"
     path.mkdir(parents=True, exist_ok=True)
     return path
 
@@ -296,11 +299,16 @@ def _read_connections() -> dict[str, str]:
 
 def _write_connections(value: dict[str, str]) -> None:
     path = _home() / CONNECTIONS_FILE
-    path.write_text(json.dumps(value, indent=2) + "\n", encoding="utf-8")
+    temporary = path.with_name(f".{path.name}.{os.getpid()}.tmp")
+    temporary.write_text(json.dumps(value, indent=2) + "\n", encoding="utf-8")
     try:
-        path.chmod(0o600)
-    except OSError:
-        pass
+        temporary.chmod(0o600)
+        os.replace(temporary, path)
+    finally:
+        try:
+            temporary.unlink()
+        except FileNotFoundError:
+            pass
 
 
 def _apply_saved_connection() -> None: