Add self-introduction output to program entry point

[Copilot]

Adds a selfIntroduction() function that prints developer identity and bio when the program runs, called at the top of main().

Changes

• src/main/main.go: New selfIntroduction() function printing name, GitHub handle, email, and a one-line bio; invoked first in main()
• .gitignore: Excludes Go module cache lock file

========== 自我介绍 ==========
姓名：张军辉（zhangjh）
GitHub：a123665404
邮箱：2244819892@qq.com
简介：热爱编程，专注于 Web3 及区块链技术，熟悉 Go 语言开发，对算法与数据结构有浓厚兴趣。
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