feat(iagent): add Feishu to channel binding flow in system prompt

After creating an instance, iAgent now asks user to choose:
钉钉 / 飞书 / 都绑定 / 跳过
- DingTalk: existing OAuth card push flow
- Feishu: bind-code flow (user sends code to Feishu bot)
- Also adds Feishu status/unbind API references

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/services/agent-service/src/infrastructure/engines/claude-code-cli/system-prompt-builder.ts

@@ -71,22 +71,35 @@ export class SystemPromptBuilder {
         '1. Ask for a name if not given\n' +
         '2. Use the Current User ID from this prompt as userId\n' +
         '3. Call the create API with Bash and report the result (id, status, containerName)\n\n' +
-        '## 招募小龙虾 + 钉钉绑定 (全语音/文字引导)\n' +
+        '## 招募小龙虾 + 渠道绑定 (全语音/文字引导)\n' +
-        'When a user says "帮我招募一只小龙虾" / "创建小龙虾" / "recruit agent" / "bind DingTalk":\n\n' +
+        'When a user says "帮我招募一只小龙虾" / "创建小龙虾" / "recruit agent" / "bind DingTalk" / "bind Feishu":\n\n' +
         '  Step 1 — Ask for a name if not provided:\n' +
         '    "你想给这只小龙虾取个什么名字？"\n\n' +
         '  Step 2 — Create the instance (Bash tool):\n' +
         '    wget -q -O- --post-data=\'{"name":"<name>","userId":"<userId>","usePool":true}\' --header="Content-Type: application/json" http://localhost:3002/api/v1/agent/instances\n' +
         '    Parse JSON to get "id" (instanceId) and "name".\n' +
-        '    Say: "好的，小龙虾「<name>」已经创建好了！"\n\n' +
+        '    Say: "好的，小龙虾「<name>」已经创建好了！接下来把它和你的即时通讯工具绑定，方便直接对话。你想绑定钉钉、飞书，还是都绑定？"\n\n' +
+        '  Step 3 — Channel binding (based on user choice):\n\n' +
+        '    [DingTalk / both]\n' +
         `${dingtalkOauthStep}\n\n` +
-        '  Step 4 — Confirm (after user says they authorized):\n' +
+        '      DingTalk confirm:\n' +
         '        wget -q -O- http://localhost:3002/api/v1/agent/channels/dingtalk/status/<instanceId>\n' +
-        '    If { "bound": true }: "太好了！小龙虾「<name>」已成功绑定钉钉，现在可以在钉钉里和它对话了！"\n' +
+        '        If { "bound": true }: "钉钉绑定成功！"\n' +
         '        If still false: "授权还没完成，请确认是否点击了钉钉里的授权按钮。"\n\n' +
+        '    [Feishu / both]\n' +
+        '      Call the bind-code API to get a 6-character code:\n' +
+        '        wget -q -O- --post-data="" http://localhost:3002/api/v1/agent/channels/feishu/bind/<instanceId>\n' +
+        '      Parse JSON: { "code": "<CODE>", "expiresAt": <ms> }\n' +
+        '      Say: "飞书绑定验证码是「<CODE>」，有效15分钟。请打开飞书，找到 iAgent 机器人，把这个验证码发给它，就完成绑定啦。"\n' +
+        '      Then poll every 5s (up to 3 min) to confirm:\n' +
+        '        wget -q -O- http://localhost:3002/api/v1/agent/channels/feishu/status/<instanceId>\n' +
+        '        If { "bound": true }: "太好了！飞书绑定成功了！"\n\n' +
+        '    [skip / neither]: "好的，之后想绑定随时可以在 IT0 App 里操作。"\n\n' +
         '  Check/unbind:\n' +
-        '    Status:  wget -q -O- http://localhost:3002/api/v1/agent/channels/dingtalk/status/<instanceId>\n' +
+        '    DingTalk status:  wget -q -O- http://localhost:3002/api/v1/agent/channels/dingtalk/status/<instanceId>\n' +
-        '    Unbind:  wget -q -O- --post-data="" http://localhost:3002/api/v1/agent/channels/dingtalk/unbind/<instanceId>',
+        '    DingTalk unbind:  wget -q -O- --post-data="" http://localhost:3002/api/v1/agent/channels/dingtalk/unbind/<instanceId>\n' +
+        '    Feishu status:    wget -q -O- http://localhost:3002/api/v1/agent/channels/feishu/status/<instanceId>\n' +
+        '    Feishu unbind:    wget -q -O- --post-data="" http://localhost:3002/api/v1/agent/channels/feishu/unbind/<instanceId>',
     );
 
     // Tenant + user context