docs: rename tool-setup to im-integration

Feishu is an IM channel, not a tool. Rename the directory to better
reflect its purpose. Also add links in CN and JA READMEs.

README.md

@@ -291,7 +291,7 @@ Technical details live in the `docs/` folder:
 
 - **[docs/ARCHITECTURE.md](docs/ARCHITECTURE.md)** — system design, module map, task layout, memory budget, protocols, flash partitions
 - **[docs/TODO.md](docs/TODO.md)** — feature gap tracker and roadmap
-- **[docs/tool-setup/](docs/tool-setup/README.md)** — configuration guides for external service integrations (Feishu, etc.)
+- **[docs/im-integration/](docs/im-integration/README.md)** — IM channel integration guides (Feishu, etc.)
 
 ## Contributing
 

README_CN.md

@@ -306,6 +306,7 @@ MimiClaw 内置 cron 调度器，让 AI 可以自主安排任务。LLM 可以通
 
 - **[docs/ARCHITECTURE.md](docs/ARCHITECTURE.md)** — 系统设计、模块划分、任务布局、内存分配、协议、Flash 分区
 - **[docs/TODO.md](docs/TODO.md)** — 功能差距和路线图
+- **[docs/im-integration/](docs/im-integration/README.md)** — IM 通道集成指南（飞书等）
 
 ## 贡献
 

README_JA.md

@@ -291,6 +291,7 @@ MimiClawにはcronスケジューラが内蔵されており、AIが自律的に
 
 - **[docs/ARCHITECTURE.md](docs/ARCHITECTURE.md)** — システム設計、モジュール構成、タスクレイアウト、メモリバジェット、プロトコル、Flashパーティション
 - **[docs/TODO.md](docs/TODO.md)** — 機能ギャップとロードマップ
+- **[docs/im-integration/](docs/im-integration/README.md)** — IMチャネル統合ガイド（Feishuなど）
 
 ## 貢献
 

docs/im-integration/README.md

@@ -1,6 +1,6 @@
-# Tool Setup Guides
+# IM Integration Guides
 
-Configuration guides for MimiClaw's external service integrations.
+Configuration guides for MimiClaw's instant messaging channel integrations.
 
 ## Guides
 
@@ -10,7 +10,7 @@ Configuration guides for MimiClaw's external service integrations.
 
 ## Overview
 
-MimiClaw integrates with external services to extend its capabilities. Each guide below walks through obtaining API credentials, configuring MimiClaw (build-time or runtime), and verifying the integration.
+MimiClaw supports multiple IM channels for interacting with the AI agent. Each guide below walks through obtaining API credentials, configuring MimiClaw (build-time or runtime), and verifying the integration.
 
 All credentials can be set in two ways: