* refactor(fingerprint): make the favicon tech table the single source
move the hash->tech map from internal/scan into internal/fingerprint
beside the hash function, exposed as LookupFaviconTech. the scan
Favicon path now resolves tech through it instead of a private map.
drop the demo-sync guard test: it existed only to keep scan's map in
sync with the yaml demo module, and that map no longer exists.
* feat(modules): name the matched tech in favicon evidence
favicon module findings now read the tech straight from the shared
fingerprint table, so a canonical hit reports "favicon mmh3=<n>
tech=<name>" instead of a bare hash. unknown hashes are unaffected.
rename the go module path from github.com/dropalldatabases/sif to
github.com/vmfunc/sif across go.mod, all imports, the golangci exclude
list, release install docs and docs. pure string rename, no logic change.
