feat: mv data folder to root

backend/app/core/data_root.py

@@ -0,0 +1,39 @@
+import os
+from pathlib import Path
+
+
+BACKEND_ROOT = Path(__file__).resolve().parents[2]
+REPO_ROOT = BACKEND_ROOT.parent
+DEFAULT_DATA_ROOT = REPO_ROOT / "data"
+LEGACY_DATA_ROOT = BACKEND_ROOT / "data"
+
+
+def get_data_root() -> Path:
+    configured = (os.getenv("DATA_ROOT") or "").strip()
+    if configured:
+        return Path(configured).expanduser().resolve()
+    if DEFAULT_DATA_ROOT.exists():
+        return DEFAULT_DATA_ROOT
+    if LEGACY_DATA_ROOT.exists():
+        print(f"[DATA_ROOT] legacy path detected: {LEGACY_DATA_ROOT}. Please migrate to {DEFAULT_DATA_ROOT}.")
+        return LEGACY_DATA_ROOT
+    return DEFAULT_DATA_ROOT
+
+
+def get_workspace_root() -> Path:
+    return get_data_root() / "workspace"
+
+
+def get_uploads_root() -> Path:
+    return get_data_root() / "uploads"
+
+
+def get_reports_root() -> Path:
+    return get_data_root() / "data"
+
+
+def ensure_data_layout() -> None:
+    get_data_root().mkdir(parents=True, exist_ok=True)
+    get_workspace_root().mkdir(parents=True, exist_ok=True)
+    get_uploads_root().mkdir(parents=True, exist_ok=True)
+    get_reports_root().mkdir(parents=True, exist_ok=True)