fix: 规范本体实体与关系名称为 PascalCase 以支持 Zep 图谱构建（fixes #178）

[i-icc]

Summary / 概要

• EN: After generating the ontology and clicking the “Build Graph” button, Zep returns HTTP 400 errors indicating that name / target must be in PascalCase.
• 中文: 在生成本体后点击「构建图谱」，Zep 返回 400 错误，提示 name / target 必须为 PascalCase。

#178

Steps to Reproduce / 复现步骤

1. Start the backend and frontend.
2. Upload a document and fill in the simulation requirement.
3. Click “Generate Ontology”.
4. Click “Build Graph”.
5. Check the backend logs and the Zep response.

Expected / 预期行为

• The graph build should succeed and nodes/edges should be created in Zep without HTTP 400 errors.

Actual / 实际行为

• Zep returns HTTP 400 errors with messages such as:
  • name must be in PascalCase format ...
  • target must be in PascalCase format ...

Additional context / 补充说明

• Some ontology entity and edge names (and their source/target) returned by the LLM are in snake_case or lowercase (e.g. works_for, person), which violates Zep’s PascalCase requirement.