Remove eager duplicate matching from jobs list responses

[DaKheera47]

Summary

• stop attaching appliedDuplicateMatch on GET /api/jobs list and full responses to remove the hot-path CPU bottleneck
• keep duplicate match hydration on job detail responses and make the client/shared types tolerate omitted list metadata
• add benchmark logging plus a dedicated benchmark:jobs script to measure route phases against a DB snapshot
• precompute normalized duplicate-match inputs so remaining detail-path matching work is cheaper

Testing

• ./orchestrator/node_modules/.bin/biome ci .
• npm run check:types:shared
• npm --workspace orchestrator run check:types
• npm --workspace gradcracker-extractor run check:types
• npm --workspace ukvisajobs-extractor run check:types
• npm --workspace orchestrator run build:client
• npm --workspace orchestrator run test:run
• npm --workspace orchestrator run benchmark:jobs