first commit

backend/app/services/file_service.py

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+import hashlib
+import os
+import shutil
+from pathlib import Path
+
+from app.core.config import settings
+from app.schemas.dashboard import StorageStats
+
+
+def compute_checksum(file_path: str) -> str:
+    sha256 = hashlib.sha256()
+    with open(file_path, "rb") as handle:
+        for chunk in iter(lambda: handle.read(4096), b""):
+            sha256.update(chunk)
+    return sha256.hexdigest()
+
+
+def ensure_data_dir() -> Path:
+    return settings.data_path
+
+
+def get_folder_size() -> int:
+    total = 0
+    for dirpath, _, filenames in os.walk(ensure_data_dir()):
+        for filename in filenames:
+            try:
+                total += os.path.getsize(Path(dirpath) / filename)
+            except OSError:
+                pass
+    return total
+
+
+def get_storage_stats() -> StorageStats:
+    ensure_data_dir()
+    disk = shutil.disk_usage(ensure_data_dir())
+    folder_used = get_folder_size()
+    usage_percent = (folder_used / disk.total) * 100 if disk.total else 0
+    return StorageStats(total=disk.total, used=disk.used, free=disk.free, folder_used=folder_used, usage_percent=usage_percent)