[Bug]: Reasoning and Tool Usage Should Appear Before Final Reply

## CoPaw Version

1.0.0.post2, but issue persists since early versions

## Description

The current display logic for AI responses is inverted. Actually, final reply appear before reasoning and tool usage, always

## Component(s) Affected

- [ ] Core / Backend (app, agents, config, providers, utils, local_models)
- [ ] Console (frontend web UI)
- [x] Channels (DingTalk, Feishu, QQ, Discord, iMessage, etc.)
- [ ] Skills
- [ ] CLI
- [ ] Documentation (website)
- [ ] Tests
- [ ] CI/CD
- [ ] Scripts / Deploy

## Environment

- **CoPaw version:** v1.0.0 post2
- **OS:** Debian GNU/Linux 12