feat(asl): Complete Day 5 - Fulltext Screening Backend API Development

- Implement 5 core API endpoints (create task, get progress, get results, update decision, export Excel)
- Add FulltextScreeningController with Zod validation (652 lines)
- Implement ExcelExporter service with 4-sheet report generation (352 lines)
- Register routes under /api/v1/asl/fulltext-screening
- Create 31 REST Client test cases
- Add automated integration test script
- Fix PDF extraction fallback mechanism in LLM12FieldsService
- Update API design documentation to v3.0
- Update development plan to v1.2
- Create Day 5 development record
- Clean up temporary test files

docs/02-通用能力层/01-LLM大模型网关/03-CloseAI集成指南.md

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docs/02-通用能力层/01-LLM大模型网关/[AI对接] LLM网关快速上下文.md

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docs/02-通用能力层/02-文档处理引擎/README.md

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docs/02-通用能力层/03-RAG引擎/README.md

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docs/02-通用能力层/04-数据ETL引擎/README.md

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docs/02-通用能力层/05-医学NLP引擎/README.md

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docs/02-通用能力层/README.md

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docs/02-通用能力层/[AI对接] 通用能力快速上下文.md

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