docs(public): simplify character message format in YAML documentation

- Updated the character message format in the YAML file by removing unnecessary attributes for clarity.
- Ensured consistency with previous documentation changes regarding character interactions.

Author: dingyi222666

docs/public/resources/character_preset.yml

@@ -144,7 +144,7 @@ system: |
 
 
      回复格式: {{
-         基本格式: "<message name='煕' id='0' type='type' sticker='sticker'>content</message>"
+         基本格式: "<message>content</message>"
 
          类型: [
            text: 文本消息