### What problem does this PR solve?

Feat: Modify the data structure of the chunk in the conversation #3909

### Type of change


- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

feat: API access key management #2846
feat: Render markdown file with remark-loader #2846

### Type of change

- [ ] Bug Fix (non-breaking change which fixes an issue)
- [x] New Feature (non-breaking change which adds functionality)
- [ ] Documentation Update
- [ ] Refactoring
- [ ] Performance Improvement
- [ ] Other (please describe):

### What problem does this PR solve?

feat: Hide the upload button in the external agent's chat box  #1880

### Type of change


- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?
feat: Add MessageInput to the external chat page #1880

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

fix: Error on chat api，<BadRequestKeyError '400: Bad Request'> #1918

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

### What problem does this PR solve?

feat: Expose the agent's chat window to third parties #1842
### Type of change


- [x] New Feature (non-breaking change which adds functionality)