- Fix Windows CI failure in test_get_annotated_filepath: compare against
os.path.abspath(...) to match the intentional abspath normalization added
by the traversal hardening (abspath prepends the drive letter on Windows).
- origin_check: narrow the bare `except:` in is_loopback() to ValueError so
genuine interrupts aren't swallowed (review nit).
- origin_check: guard .port access in is_cross_origin_forbidden() so a
malformed/out-of-range port (e.g. Origin: http://127.0.0.1:99999) fails
closed with a 403 instead of surfacing an uncaught 500 in the middleware.
- server /view: escape backslash/quote in the Content-Disposition filename
(RFC 6266 quoted-string) so a filename containing a double quote can't
malform the response header.
- CVE-2026-56670: force download of SVG/XML responses on /view to prevent stored XSS
- CVE-2026-56671: contain /experiment/models/preview reads within the model folder
- CVE-2026-56672: stop inline rendering of uploaded /userdata/{file} content
- CVE-2026-56673: prevent path traversal in get_annotated_filepath (LoadImage /prompt input)
- CVE-2026-56674: reject opaque/null Origin to close the CSRF middleware bypass
Adds regression tests under tests-unit/security_test/ covering all five.
