docs: 更新徽章为 shields.io 动态格式，添加 release 徽章

Merge pull request #2 from SpellingDragon/feat/improve-text-splitting

fix: 更新示例代码以适配新的SendLongText签名，添加Bot.Media()方法

feat: 优化智能分片逻辑，减少消息碎片化

docs: add CHANGELOG.md for v1.2.0 release

feat: add WithLogFile and WithLogWriter options for unified logging

Add iLink API Reference link to README (#1)

docs: restructure README for better readability

lint: raise gocyclo threshold to 30 for complex text splitting logic

fix: resolve remaining lint issues

lint: exclude errcheck in test files for pragmatic testing

fix: handle remaining error return values for linter errcheck

fix: handle error return values for linter errcheck

docs: add wiki pages (Home, Architecture, Middleware Guide)

docs: update project structure and add middleware examples