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feat(tenancy): resolve tenants by host, provision them, seed two #89

Job	Run time
backend integration (Testcontainers)	1m 31s
backend (build + unit + arch + contract)	1m 48s
meta (compose + commit hygiene + link audit)	8s
frontend (typecheck + lint + build + test)	44s
secret scan (leakwatch)	1m 11s
openapi diff (deferred to Phase 02d)	-1s
lighthouse budget (deferred to Phase 02d)	-1s
	5m 20s