Add DELETE /api/admin/backup/{filename} and delete button in Settings

backend/main.py

@@ -1929,6 +1929,19 @@ async def restore_backup(
     return {"restored": filename, "auto_backup": auto_dst.name if src.exists() else None}
 
 
+@app.delete("/api/admin/backup/{filename}")
+async def delete_backup(
+    filename: str,
+    current_user: User = Depends(get_current_admin),
+):
+    """Delete a backup file."""
+    fp = BACKUP_DIR / filename
+    if not fp.exists() or ".." in filename:
+        raise HTTPException(status_code=404, detail="Backup not found")
+    fp.unlink()
+    return {"deleted": filename}
+
+
 @app.post("/api/admin/reset/{section}")
 async def reset_section(
     section: str,