Migrate knowledge base charts from JSON to GPT-Vis syntax format

[Copilot]

• 1. Delete "数据文本 - Vis Text.md" knowledge base file
• 2. Create new "总结摘要 - Summary.md" knowledge base file with proper naming format
• 3. Update all chart knowledge base files to convert JSON examples to syntax format
  • All 26 chart types converted
• 4. Ensure markdown file naming format is consistent across all knowledge base files
• 5. Verify all changes are correct (tests passing, code review clean, security scan clean)
• 6. Address feedback on Summary knowledge base:
  • Added missing entity types (dim_name, delta_value_pos/neg, ratio_value_pos/neg)
  • Converted entity types list to table format with examples
  • Removed vis prefix from all Summary examples
  • Enhanced T8 syntax reference with complete document structure (headings, paragraphs, lists, text formatting)

Original prompt

知识库 knowledges 中的 markdown 优化：

1. 删除 vis text 知识库
2. 增加 summary 知识库
3. 所有图表知识库内容中的 json 配置改成 syntax 语法，并一定要确保正确性。
4. 知识库 markdown 文件名格式风格保持一致

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[hustcc]

@copilot summary 有几个问题：

1. 实体类型介绍不全，应该缺几个
2. 每一个实体都要加一个简单的案例，最好用 table 来表述
3. 只有 summary 的语法不需要加 vis 前缀

[hustcc]

fixed #335

[hustcc]

@copilot summary 关于 T8 语法的表述部分，可以参考 src/vis/summary/README.md

[Copilot]

@copilot summary 有几个问题：

1. 实体类型介绍不全，应该缺几个...

已完成修改（commit 0238285）：

1. ✅ 补充了缺失的实体类型：dim_name、delta_value_pos、delta_value_neg、ratio_value_pos、ratio_value_neg
2. ✅ 将实体类型改为 table 格式，每个实体都包含描述和示例
3. ✅ 移除了所有 Summary 示例中的 vis 前缀

[Copilot]

@copilot summary 关于 T8 语法的表述部分，可以参考 src/vis/summary/README.md

已参考 src/vis/summary/README.md 完善 T8 语法表述（commit 5f77cab）：

• ✅ 添加文档结构说明（标题、段落、列表）
• ✅ 添加文本格式说明（粗体、斜体、下划线、链接）
• ✅ 完善实体标注语法说明，包含完整示例