* refactor: share one helper for the per-user sif config directory
the modules loader and the framework custom-signature loader each
hand-rolled the same ~/.config/sif/<sub> (and %LocalAppData%\sif\<sub>
on windows) path. extract internal/sifpath.UserSubdir and route both
through it so the per-user layout is defined in one place.
no behavior change: the helper reproduces the existing paths exactly.
* refactor: read capped response bodies through one httpx helper
the frameworks detector and the module executor each defined their own
5 MB body cap and ran the same io.ReadAll(io.LimitReader(...)) read. move
the cap and the read into httpx.MaxBodySize / httpx.ReadCappedBody so both
scanners share one ceiling instead of two consts that can drift.
no behavior change: the cap value and read semantics are unchanged.
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.
load yaml-defined detectors from ~/.config/sif/signatures (AppData\Local
on windows), mirroring the user-modules convention, so a framework sif
does not ship can be detected without a rebuild. they load lazily once
per run from DetectFramework and register alongside the built-ins.
each file is one detector, scored by the same weighted signature match as
the built-ins. confidence is linear rather than their sigmoid (importing
it would cycle), so a detector clears the 0.5 threshold once its matched
weights pass half. a name matching a built-in overrides it and inherits
that built-in's version patterns and cves, the same as a user module. a
single unparseable file warns and is skipped rather than failing the scan.
implements the custom signature support help-wanted item in contributing.
