Chore/update readme and gomod

README.md

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-[English](./README.md) | [繁體中文](./README.zh-TW.md) | [简体中文](./README.zh-CN.md)
-
+<div align="center">
 
 # LeetSolv
+
 [![Release](https://img.shields.io/github/release/eannchen/leetsolv.svg)](https://github.com/eannchen/leetsolv/releases)
 [![Go Report Card](https://goreportcard.com/badge/github.com/eannchen/leetsolv)](https://goreportcard.com/report/github.com/eannchen/leetsolv)
 [![CI/CD](https://github.com/eannchen/leetsolv/actions/workflows/ci.yml/badge.svg)](https://github.com/eannchen/leetsolv/actions/workflows/ci.yml)
 
+[English](./README.md) | [繁體中文](./README.zh-TW.md) | [简体中文](./README.zh-CN.md)
+
+</div>
+
 **LeetSolv** is a CLI tool for **Data Structures and Algorithms (DSA)** problem revision with **spaced repetition**. It supports problems from [LeetCode](https://leetcode.com) and [HackerRank](https://hackerrank.com). Powered by a customized [SuperMemo 2](https://en.wikipedia.org/wiki/SuperMemo) algorithm that incorporates **familiarity**, **importance**, and **reasoning** to move beyond rote memorization.
 
 > ***Zero Dependencies**: Implemented in pure Go with no third-party libraries or external tools—full control over all implementations. See [MOTIVATION.md](document/MOTIVATION.md).*

README.zh-CN.md

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-[English](./README.md) | [繁體中文](./README.zh-TW.md) | [简体中文](./README.zh-CN.md)
+<div align="center">
 
 # LeetSolv
+
 [![Release](https://img.shields.io/github/release/eannchen/leetsolv.svg)](https://github.com/eannchen/leetsolv/releases)
 [![Go Report Card](https://goreportcard.com/badge/github.com/eannchen/leetsolv)](https://goreportcard.com/report/github.com/eannchen/leetsolv)
 [![CI/CD](https://github.com/eannchen/leetsolv/actions/workflows/ci.yml/badge.svg)](https://github.com/eannchen/leetsolv/actions/workflows/ci.yml)
 
+[English](./README.md) | [繁體中文](./README.zh-TW.md) | [简体中文](./README.zh-CN.md)
+
+</div>
+
 **LeetSolv** 是一个命令行工具，专为 **数据结构与算法 (DSA)** 问题复习而设计，带有 **间隔重复 (spaced repetition)** 功能。支持 [LeetCode](https://leetcode.com) 和 [HackerRank](https://hackerrank.com) 平台的题目。它由一个定制的 [SuperMemo 2](https://en.wikipedia.org/wiki/SuperMemo) 算法驱动，该算法结合了 **熟悉度**、**重要性** 和 **推理** 等变量，避免死记硬背。
 
 > ***零依赖**: 完全用纯 Go 实现，不使用第三方库或外部工具——完全控制底层实现。详见 [MOTIVATION.md](document/MOTIVATION.md)。*

README.zh-TW.md

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-[English](./README.md) | [繁體中文](./README.zh-TW.md) | [简体中文](./README.zh-CN.md)
+<div align="center">
 
 # LeetSolv
+
 [![Release](https://img.shields.io/github/release/eannchen/leetsolv.svg)](https://github.com/eannchen/leetsolv/releases)
 [![Go Report Card](https://goreportcard.com/badge/github.com/eannchen/leetsolv)](https://goreportcard.com/report/github.com/eannchen/leetsolv)
 [![CI/CD](https://github.com/eannchen/leetsolv/actions/workflows/ci.yml/badge.svg)](https://github.com/eannchen/leetsolv/actions/workflows/ci.yml)
 
+[English](./README.md) | [繁體中文](./README.zh-TW.md) | [简体中文](./README.zh-CN.md)
+
+</div>
+
 **LeetSolv** 是一個命令列工具，專為 **資料結構與演算法 (DSA)** 問題複習而設計，帶有 **間隔重複 (spaced repetition)** 功能。支援 [LeetCode](https://leetcode.com) 和 [HackerRank](https://hackerrank.com) 平台的題目。它由一個客製化的 [SuperMemo 2](https://en.wikipedia.org/wiki/SuperMemo) 演算法驅動，該演算法結合了 **熟悉度**、**重要性** 和 **推理** 等變數，避免死記硬背。
 
 > ***零依賴**: 完全用純 Go 語言實現，沒有第三方庫或外部工具——完全控制底層實現。詳見 [MOTIVATION.md](document/MOTIVATION.md)。*

go.mod

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 module github.com/eannchen/leetsolv
 
-go 1.25.0
+go 1.25