Use mcdsl/terminal for all password prompts

Replace direct golang.org/x/term calls with mcdsl/terminal.ReadPassword
across mciasctl (6 sites), mciasgrpcctl (1 site), and mciasdb (1 site).
Aligns with the new CLI security standard in engineering-standards.md.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

vendor/modernc.org/libc/libc_windows.go

@@ -7,7 +7,6 @@ package libc // import "modernc.org/libc"
 import (
 	"errors"
 	"fmt"
-	"golang.org/x/sys/windows"
 	"math"
 	mbits "math/bits"
 	"os"
@@ -24,6 +23,7 @@ import (
 	"unsafe"
 
 	"github.com/ncruces/go-strftime"
+	"golang.org/x/sys/windows"
 	"modernc.org/libc/errno"
 	"modernc.org/libc/fcntl"
 	"modernc.org/libc/limits"
@@ -7702,17 +7702,6 @@ func X__mingw_strtod(t *TLS, s uintptr, p uintptr) float64 {
 	return Xstrtod(t, s, p)
 }
 
-func Xstrtod(t *TLS, s uintptr, p uintptr) float64 {
-	if __ccgo_strace {
-		trc("tls=%v s=%v p=%v, (%v:)", t, s, p, origin(2))
-	}
-	r0, _, err := procStrtod.Call(uintptr(s), uintptr(p))
-	if err != windows.NOERROR {
-		t.setErrno(err)
-	}
-	return math.Float64frombits(uint64(r0))
-}
-
 // int vsnprintf(char *str, size_t size, const char *format, va_list ap);
 func X_vsnprintf(t *TLS, str uintptr, size types.Size_t, format, ap uintptr) int32 {
 	if __ccgo_strace {
@@ -7862,3 +7851,26 @@ func X_wstat32(tls *TLS, path, buffer uintptr) (r int32) {
 	}
 	return int32(r0)
 }
+
+func Xbsearch(tls *TLS, key uintptr, base uintptr, nel Tsize_t, width Tsize_t, cmp uintptr) uintptr {
+	if __ccgo_strace {
+		trc("tls=%v key=%v base=%v nel=%v width=%v cmp=%v, (%v:)", tls, key, base, nel, width, cmp, origin(2))
+	}
+	var try uintptr
+	var sign int32
+	for nel > 0 {
+		try = base + uintptr(width*(nel/2))
+		sign = (*struct {
+			f func(*TLS, uintptr, uintptr) int32
+		})(unsafe.Pointer(&struct{ uintptr }{cmp})).f(tls, key, try)
+		if sign < 0 {
+			nel /= 2
+		} else if sign > 0 {
+			base = try + uintptr(width)
+			nel -= nel/2 + 1
+		} else {
+			return try
+		}
+	}
+	return 0
+}