feat(api): enrich the jobs schema with salary, seniority, sponsorship, and liveness (#258)

[Taleef7]

Closes #258 (Epic #245).

Summary of Changes

1. Database Migration (013_enrich_jobs_schema.sql):

   • Added columns to jobs: salary_min, salary_max, salary_currency, seniority, sponsor_likelihood, content_hash, last_seen_at, and liveness (default 'active').
   • Created indices on content_hash, liveness, (salary_min, salary_max), seniority, and sponsor_likelihood.

2. Job Enrichment Utilities (apps/api/src/lib/job-enrich.ts):

   • Implemented parseSalaryFromText(text): handles comma ranges, k-suffixes, annualized hourly rates (x2080), noise filtering (< 10k or > 2M), and prioritizes currency/salary-scoped ranges over arbitrary numeric ranges (such as years of experience).
   • Implemented parseSeniority(title, description): evaluates title first, mapping leadership, senior, junior, and mid levels with fail-closed 'unknown' fallback.
   • Implemented computeContentHash({ company, title, descriptionText }): deterministic sha256 hex string.

3. Source Normalization & Store Fallbacks:

   • Updated normalizeAdzuna to capture and round salary_min and salary_max to USD.
   • Updated createJob in Postgres and in-memory stores to compute fallbacks for salary, seniority, and content hash if not provided by the ingestion source.
   • Updated seedDemoData and mock-store.ts seeds with the new schema fields.

4. Testing & Verification:

   • Added unit test suite apps/api/src/lib/job-enrich.test.ts.
   • Extended apps/api/src/lib/job-sources/normalize.test.ts and apps/api/src/data/job-store.test.ts.
   • All 278 API tests and 322 agent tests pass cleanly. Full monorepo check (npm run check) succeeds with 0 errors.

[Taleef7]

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