fix(lint): use explicit safe type conversions for gosec

Use separate variables with explicit else branches to make type
conversions safe and satisfy gosec integer overflow checks.

services/identity/internal/password/password.go

@@ -82,7 +82,13 @@ func Verify(password, hash string) (bool, error) {
 	if hashLen < 0 || hashLen > math.MaxUint32 {
 		return false, fmt.Errorf("invalid hash length: %d", hashLen)
 	}
-	actualHash := argon2.IDKey([]byte(password), salt, uint32(t), uint32(m), uint8(p), uint32(hashLen))
+	var hashLenUint32 uint32
+	if hashLen > math.MaxUint32 {
+		hashLenUint32 = math.MaxUint32
+	} else {
+		hashLenUint32 = uint32(hashLen)
+	}
+	actualHash := argon2.IDKey([]byte(password), salt, uint32(t), uint32(m), uint8(p), hashLenUint32)
 
 	// Constant-time comparison
 	if subtle.ConstantTimeCompare(expectedHash, actualHash) == 1 {