- Add core/network_utils.py with URL validation, public-IP enforcement,
redirect validation, and safe request_public_url/validate_public_http_url helpers
- Replace direct requests calls in downloader/type_utils/sources with
request_public_url so redirects are validated before follow-up
- Replace netloc string checks with host_matches_domain for CivitAI,
CivArchive, and HuggingFace host matching
- Add HuggingFace Xet download backend with progress reporting and
cancellation support via hf_xet/huggingface_hub
- Harden aria2 installer: reject symlinks/special files in archives,
restrict custom aria2c paths to the managed install, and update UI copy
- Normalize paths with realpath and enforce configured model roots in
local hash/metadata routes, plus remove caller-selected metadata_path
injection in sidecar writing
- Sanitize download/network errors to strip signed query strings before
logging or showing them to the user