Initial certificate system

backend/app/core/paths.py

@@ -0,0 +1,15 @@
+from pathlib import Path
+
+from app.core.config import settings
+
+DATA_ROOT = Path(settings.data_root)
+
+
+def ensure_data_dirs() -> None:
+    for name in ["uploads", "error-reports", "exports", "pdf-cache"]:
+        (DATA_ROOT / name).mkdir(parents=True, exist_ok=True)
+
+
+def data_path(name: str) -> Path:
+    ensure_data_dirs()
+    return DATA_ROOT / name