规则说明
保留每个单词的首尾字符，中间字符替换为星号（默认）或字符数量
示例：password → p******d，secret → s****t
工具說明
Replace the middle portion of strings with asterisks or random characters, keeping the first and last characters visible — ideal for masking passwords, emails, and phone numbers in screenshots.
obfuscate混淆隐私mask隐藏censor