chore: remove 13 stale files and clean up project structure

Removed:
- app.py (deprecated Streamlit UI, replaced by api_server.py + frontend/)
- start_agent_jrxml.py (old launcher, replaced by start.py)
- test_reorder.py, e2e_test.py (ad-hoc/outdated test scripts)
- ocr_raw_positions.json (debug output)
- ARCHITECTURE.md, CODE_GUIDE.md, RAG_INTEGRATION.md, ROADMAP.md (superseded by CLAUDE.md)
- EVALUATION_REPORT.md (auto-generated)
- scripts/init_kb.py (replaced by init_default_kb.py)
- validation_service/validate.bat (redundant, start.py covers it)
- sessions/*.json (34 test session files, already gitignored)

Updated:
- CLAUDE.md: removed stale file entries from key mapping table
- README.md: updated init script reference and removed validate.bat
- .gitignore: removed EVALUATION_REPORT.md entry

README.md

@@ -144,7 +144,6 @@ jrxml-agent/
     *.md                    10 个 Prompt 模板文件
   validation_service/
     main.py                 FastAPI 验证服务器
-    validate.bat            Windows 启动器
   data/
     sample_templates/       知识库的 JRXML 模板
     corrections/            错误修正案例
@@ -152,7 +151,7 @@ jrxml-agent/
     app.log                 应用日志（节点流转、路由、用户交互）
     llm.log                 LLM 调用日志（完整 prompt / response）
   scripts/
-    init_kb.py              Chroma 知识库初始化脚本
+    init_default_kb.py      多租户默认知识库初始化脚本
   tests/
     test_validation.py      验证服务测试
     test_agent.py           代理集成测试