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/04-开发规范/01-数据库设计规范.md

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docs/04-开发规范/02-API设计规范.md

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docs/04-开发规范/03-数据库全局视图.md

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docs/04-开发规范/04-API路由总览.md

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