fix: add missing printfStdout, printlnStdout, scanlnStdin, FetchBlob, and FetchAndDecryptBlob methods

These methods were referenced in main but never defined, causing compilation
failures. They were introduced by merges that assumed dependent PRs were
already merged.

internal/vaultik/snapshot.go

@@ -4,8 +4,8 @@ import (
 	"encoding/json"
 	"fmt"
 	"os"
-	"regexp"
 	"path/filepath"
+	"regexp"
 	"sort"
 	"strings"
 	"text/tabwriter"