feat: FTS5 search index with background rebuild and 30-day default wi… #254

Job	Run time
API integration tests + coverage (macos-latest)	21s
Frontend unit tests (vitest) (macos-latest)	28s
API integration tests + coverage (windows-latest)	1m 0s
pytest (macos-latest)	44s
Verify prod requirements.txt is sufficient	8s
mypy	21s
pytest (windows-latest)	1m 9s
Frontend unit tests (vitest) (ubuntu-latest)	21s
API integration tests + coverage (ubuntu-latest)	18s
Performance benchmarks (gated)	32s
pytest (ubuntu-latest)	53s
ruff + pip-audit (ubuntu-latest)	22s
ruff + pip-audit (macos-latest)	22s
Frontend unit tests (vitest) (windows-latest)	55s
ruff + pip-audit (windows-latest)	59s
	8m 53s

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