fix(adminui): link the dead scoped-CSS bundle; add btn/notice-alert/tree-twist rules

Foundation task of the AdminUI UI sweep. CSS/link/doc only — no behavior change
beyond restoring styles that were built but never served.

- App.razor: link the RCL's scoped-CSS bundle
  (_content/ZB.MOM.WW.OtOpcUa.AdminUI/ZB.MOM.WW.OtOpcUa.AdminUI.bundle.scp.css).
  It is produced on every compile and served by the Host, but nothing referenced
  it, so ContextMenu.razor.css was dead at runtime and context menus rendered
  in-flow with no position:fixed.
- site.css: three additions.
  * .btn / .btn-sm sizing as Bootstrap CSS-VARIABLE overrides (never box
    properties — .btn-group depends on Bootstrap's own .btn rules for its seams
    and end-cap radii). Theme 0.3.1 ships no .btn rule, so Bootstrap's 1rem
    applied against the theme's 0.9rem body. Upstreaming candidate, same as the
    ignitionoee router's app.css.
  * .notice-alert — red variant of the kit's amber .notice, on the --bad/
    --bad-bg/--bad-border tokens. The 13 existing call sites hack this with
    style="border-color:var(--alert)", and no --alert token exists anywhere, so
    the tint silently no-ops today. Call-site migration is a separate task.
  * .tree-twist — shared 18px expander column for the tree components, replacing
    repeated inline style="width:18px". Rows are d-flex, so flex-basis is what
    actually holds the column. Adoption is a separate task.
- ContextMenu.razor.css: correct the header comment — the kit is light-only
  (no dark block in Theme 0.3.1, site.css, or this file). No rule changes.
- docs/Telemetry.md: record that driver-health is keyed per driver instance
  across the cluster, not per Akka member (the wire record carries no per-member
  identity). The fact previously lived only in Hosts.razor page copy.
- docs/Configuration.md: new audit-log subsection recording that EventId gives
  cross-restart dedup, enforced by the filtered unique index
  UX_ConfigAuditLog_EventId, so a retried apply inserts no duplicate row;
  CorrelationId joins a row to its originating workflow. Previously only in the
  historical v2 rebuild plan and ClusterAudit page copy.

src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Components/App.razor

@@ -16,6 +16,11 @@
     <link rel="stylesheet" href="_content/ZB.MOM.WW.OtOpcUa.AdminUI/lib/bootstrap/css/bootstrap.min.css"/>
     <ThemeHead />
     <link rel="stylesheet" href="_content/ZB.MOM.WW.OtOpcUa.AdminUI/css/site.css"/>
+    @* ASP.NET scoped-CSS bundle for this RCL's *.razor.css files (ContextMenu.razor.css and
+       anything added later). The RCL builds it on every compile, but nothing referenced it —
+       so the scoped rules were dead at runtime and the context menus rendered in-flow with
+       no position:fixed. It is a Reference-mode asset, hence the RCL's _content/ base path. *@
+    <link rel="stylesheet" href="_content/ZB.MOM.WW.OtOpcUa.AdminUI/ZB.MOM.WW.OtOpcUa.AdminUI.bundle.scp.css"/>
     <HeadOutlet/>
 </head>
 <body>

src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Components/Shared/ContextMenu.razor.css

@@ -1,5 +1,7 @@
 /* Scoped styles for ContextMenu. Colours come from the shared ZB.MOM.WW.Theme
-   tokens (theme.css) so the menu tracks the app palette in light and dark. */
+   tokens (theme.css) so the menu tracks the app palette. The kit is light-only —
+   Theme 0.3.1 ships no dark-scheme block, and neither does site.css or this file —
+   so there is no dark variant to track. */
 
 .ctx-surface {
     display: inline;