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* fix(uploads): delete the requested upload, not a symlink's target delete_file_safe resolved the requested path before unlinking it. The uploads directory is writable from local and AIO sandboxes, so a symlink planted under an upload name was followed: deleting alias.pdf removed the victim.pdf it pointed to, and the companion cleanup then removed victim.md, while the link itself survived and the call reported "Deleted alias.pdf". A link resolving outside the directory was already refused by the traversal check, so the damage stayed inside the thread's uploads. The function now checks and unlinks the requested entry itself and treats a symlink as not found, the same way list_files_in_dir already hides it. unlink() never follows the final component, so a file swapped for a link between the check and the unlink removes only the link. Tests cover the helper, the Gateway DELETE route, and DeerFlowClient.delete_upload. * docs(changelog): note upload delete symlink fix (#5547)