feat(issue): add body field to IssueItem type and implement issue creation and completion routes

- Added 'body' field to IssueItem type in index.ts
- Created new routes for issue creation and completion in issue.ts
- Implemented validation for required parameters in issue creation and completion
- Added a new list route for issues in list.ts

agent/routes/issues/list.ts

@@ -0,0 +1,3 @@
+import { createSkill, tool } from '@kevisual/router';
+import { app, cnb } from '../../app.ts';
+