add desktop build support

backend/runtime_paths.py

@@ -0,0 +1,54 @@
+from __future__ import annotations
+
+import os
+import sys
+from pathlib import Path
+
+APP_NAME = "Argonode"
+
+
+def project_root() -> Path:
+    return Path(__file__).resolve().parent.parent
+
+
+def resource_root() -> Path:
+    if getattr(sys, "frozen", False):
+        return Path(getattr(sys, "_MEIPASS", Path(sys.executable).resolve().parent))
+    return project_root()
+
+
+def frontend_dir() -> Path:
+    bundled = resource_root() / "frontend"
+    if bundled.exists():
+        return bundled
+    return project_root() / "frontend"
+
+
+def frontend_dist_dir() -> Path:
+    return frontend_dir() / "dist"
+
+
+def app_data_dir() -> Path:
+    override = os.getenv("ARGONODE_APPDATA")
+    if override:
+        return Path(override).expanduser().resolve()
+
+    if getattr(sys, "frozen", False):
+        local_appdata = os.getenv("LOCALAPPDATA")
+        base_dir = Path(local_appdata) if local_appdata else Path.home() / "AppData" / "Local"
+        return (base_dir / APP_NAME).resolve()
+
+    return project_root()
+
+
+def input_dir() -> Path:
+    return app_data_dir() / "input"
+
+
+def output_dir() -> Path:
+    return app_data_dir() / "output"
+
+
+def ensure_runtime_dirs() -> None:
+    input_dir().mkdir(parents=True, exist_ok=True)
+    output_dir().mkdir(parents=True, exist_ok=True)