feat: FTS5 search index with background rebuild and 30-day default wi… #257

Job	Run time
API integration tests + coverage (ubuntu-latest)	17s
mypy	26s
Verify prod requirements.txt is sufficient	7s
ruff + pip-audit (macos-latest)	23s
pytest (macos-latest)	44s
Frontend unit tests (vitest) (ubuntu-latest)	24s
Frontend unit tests (vitest) (windows-latest)	1m 5s
pytest (ubuntu-latest)	43s
API integration tests + coverage (windows-latest)	56s
Performance benchmarks (gated)	29s
ruff + pip-audit (windows-latest)	1m 11s
API integration tests + coverage (macos-latest)	17s
Frontend unit tests (vitest) (macos-latest)	35s
pytest (windows-latest)	1m 14s
ruff + pip-audit (ubuntu-latest)	20s
	9m 11s

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