feat(rust): Admin → Rust servers page and the next wipe on the web (phase 16)

The module had no page for its own server rows: they were written only
through PUT /admin/rust/servers/:id, and the README described an
"Admin → Rust" server form that did not exist. D133 (org lead) builds it:
add, edit, test and delete a server, with the D130 wipe schedule in the
same form. The token stays write-only and an edit sends the stored
protocol back rather than re-stamping the row.

The next wipe shows on the server list and in the server page's header,
in the reader's own clock, marked "rescheduled" for a one-off date.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E14m6SuuY6i1vASFeGDBeY

client/src/icons.jsx

@@ -95,4 +95,19 @@ export const IconEye = () => (
   </Icon>
 )
 
-export default { IconLink, IconKey, IconSliders, IconEye }
+/**
+ * Two stacked units — the admin sidebar's row for the servers themselves.
+ *
+ * The one row that is about the machines rather than what happens on them: the
+ * sidecar each one answers through, and when each one wipes.
+ */
+export const IconServer = () => (
+  <Icon>
+    <rect x="3" y="4" width="18" height="7" rx="1.5" />
+    <rect x="3" y="13" width="18" height="7" rx="1.5" />
+    <path d="M7 7.5h.01" />
+    <path d="M7 16.5h.01" />
+  </Icon>
+)
+
+export default { IconLink, IconKey, IconSliders, IconEye, IconServer }