chore(cleanup): delete OtOpcUa.Server, OtOpcUa.Admin, and obsolete v1 tests

Task 56: removes the legacy in-process Server + Admin Web project + their test
projects (Server.Tests, Admin.Tests, Admin.E2ETests). The fused OtOpcUa.Host
binary built across Phases 1-9 is now the sole production entry point.

What happened to the 47 legacy Admin Blazor pages: per follow-up F15, the
v1 architecture's draft/publish UX is replaced by v2's live-edit + snapshot-
deploy model, so a 1:1 migration is not meaningful. The mechanical move via
git mv preserves the history; service classes + page bodies that referenced
removed v1 types (ConfigGeneration, RedundancyRole, GenerationId) were
deleted. AdminUI now ships a minimal Home page + the v2 Deployments page.

Per-page rebuild against the v2 surface is tracked as F15. The v2 Deployments
page (Task 52) is the only first-party UI shipping in this PR.

Task 57: solution build green; 84+ tests green across active v2 + legacy
driver test projects.

src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/wwwroot/lib/bootstrap/README.md

@@ -0,0 +1,16 @@
+# Bootstrap 5.3.3 — vendored copy
+
+Per `docs/v2/admin-ui.md` "Tech Stack" the Admin UI vendors Bootstrap 5 here so
+the app has no public-CDN dependency — air-gapped fleet deployments must work
+without internet egress.
+
+| File | Source |
+|------|--------|
+| `css/bootstrap.min.css`           | https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css |
+| `css/bootstrap.min.css.map`       | https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css.map |
+| `js/bootstrap.bundle.min.js`      | https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js |
+| `js/bootstrap.bundle.min.js.map`  | https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js.map |
+
+Bootstrap is MIT-licensed (https://github.com/twbs/bootstrap/blob/main/LICENSE).
+To upgrade, re-download all four files at the matching version and bump this
+table.