docs: update Feishu plugin docs

extensions/feishu/README.md

@@ -0,0 +1,47 @@
+# @openclaw/feishu
+
+Feishu/Lark channel plugin for OpenClaw (WebSocket bot events).
+
+## Install (local checkout)
+
+```bash
+openclaw plugins install ./extensions/feishu
+```
+
+## Install (npm)
+
+```bash
+openclaw plugins install @openclaw/feishu
+```
+
+Onboarding: select Feishu/Lark and confirm the install prompt to fetch the plugin automatically.
+
+## Config
+
+```json5
+{
+  channels: {
+    feishu: {
+      accounts: {
+        default: {
+          appId: "cli_xxx",
+          appSecret: "xxx",
+          domain: "feishu",
+          enabled: true,
+        },
+      },
+      dmPolicy: "pairing",
+      groupPolicy: "open",
+      blockStreaming: true,
+    },
+  },
+}
+```
+
+Lark (global) tenants should set `domain: "lark"` (or a full https:// domain).
+
+Restart the gateway after config changes.
+
+## Docs
+
+https://docs.openclaw.ai/channels/feishu