feat: FTS5 search index with background rebuild and 30-day default wi… #251

Job	Run time
mypy	23s
Performance benchmarks (gated)	34s
API integration tests + coverage (windows-latest)	1m 1s
Verify prod requirements.txt is sufficient	11s
Frontend unit tests (vitest) (windows-latest)	47s
ruff + pip-audit (ubuntu-latest)	19s
API integration tests + coverage (macos-latest)	19s
Frontend unit tests (vitest) (macos-latest)	35s
Frontend unit tests (vitest) (ubuntu-latest)	23s
pytest (ubuntu-latest)	42s
pytest (windows-latest)	1m 26s
ruff + pip-audit (windows-latest)	1m 1s
ruff + pip-audit (macos-latest)	34s
pytest (macos-latest)	46s
API integration tests + coverage (ubuntu-latest)	18s
	9m 19s

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