Update README with maintenance notice for Feishu support

fix: update installation command from 'plugin' to 'plugins' in documentation

Fix command for installing plugins in README

Revise README for Openclaw Feishu plugin details

Fix capitalization of 'Openclaw' in README

feat: 将项目和依赖从 Clawdbot 迁移至 Openclaw，并新增插件开发文档。

feat: release v0.1.1

feat: add multi-account support with independent HTTP callback routes

fix: rename package to feishu to match plugin ID

fix: use clawdbot.extensions instead of moltbot.extensions

docs: simplify installation instructions in README by removing manual installation steps

docs: update installation instructions with actual repo URL

feat: initial release of clawdbot-feishu plugin