refactor: remove dead code and rename V2 files (#541)

* refactor: remove V1 dead code and rename V2 files

- Delete extractor/ package (V1 Extractor interface and registry)
- Delete browserdata/ package (V1 orchestrator, outputter, 9 sub-packages)
- Delete V1 browser implementations (chromium.go, chromium_{platform}.go, firefox.go)
- Delete types/types.go (V1 DataType enum) and utils/byteutil/
- Remove gocsv and go-sqlmock dependencies, demote x/text to indirect
- Upgrade keychainbreaker v0.1.0 → v0.2.5
- Rename chromium_new.go → chromium.go, firefox_new.go → firefox.go

* refactor: remove unused V1 utility functions

Remove functions no longer called by V2 code:
- fileutil: IsDirExists, CopyDir, BrowserName, ReadFile, CopyFile,
  Filename, ParentDir, ParentBaseDir, BaseDir
- typeutil: Keys, IntToBool

utils/typeutil/typeutil.go

@@ -4,30 +4,6 @@ import (
 	"time"
 )
 
-// Keys returns a slice of the keys of the map. based with go 1.18 generics
-func Keys[K comparable, V any](m map[K]V) []K {
-	r := make([]K, 0, len(m))
-	for k := range m {
-		r = append(r, k)
-	}
-	return r
-}
-
-// Signed is a constraint that permits any signed integer type.
-// If future releases of Go add new predeclared signed integer types,
-// this constraint will be modified to include them.
-type Signed interface {
-	~int | ~int8 | ~int16 | ~int32 | ~int64
-}
-
-func IntToBool[T Signed](a T) bool {
-	switch a {
-	case 0, -1:
-		return false
-	}
-	return true
-}
-
 func Reverse[T any](s []T) []T {
 	h := make([]T, len(s))
 	for i := 0; i < len(s); i++ {