feat(rust): zone presets, and the zone step's options, messages and dome (PLAN_REDESIGNS §3, D210)

Admin → Rust zone presets: named sets of ZoneManager flags and settings for
one server, several, or every server (D195), ticked in groups read from each
server's own ZoneManager list in its last hello (D211). A flag not on a
covered server is refused on save with the server named; two presets of one
name may not share a server.

rust.zone.open gains options (one line, NoBuild, radiation=10), enterMessage,
leaveMessage, delivery, dome and domeStack. The options field's dropdown is
rust.options.zone_presets, whose row VALUE is the preset's line, so picking
one copies it into the step (D210) and no published event changes when a
preset does. The line and the dome are checked against the server's hello
on save and in a dry run; bad-option and dome-unavailable are permanent.

Schema: rust_zone_presets, rust_zone_preset_servers. Swagger fragment and
routes.manifest regenerated against the pinned core f0e7d2a.

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

routes.manifest.json

@@ -16,6 +16,11 @@
       "path": "/api/v1/admin/rust/servers/:id",
       "tier": "public"
     },
+    {
+      "method": "DELETE",
+      "path": "/api/v1/admin/rust/zones/presets/:id",
+      "tier": "public"
+    },
     {
       "method": "DELETE",
       "path": "/api/v1/admin/users/:id/rust/links/:steamId",
@@ -91,6 +96,11 @@
       "path": "/api/v1/admin/rust/voice",
       "tier": "public"
     },
+    {
+      "method": "GET",
+      "path": "/api/v1/admin/rust/zones",
+      "tier": "public"
+    },
     {
       "method": "GET",
       "path": "/api/v1/admin/users/:id/rust/links",
@@ -261,6 +271,11 @@
       "path": "/api/v1/admin/rust/servers/:id/test",
       "tier": "public"
     },
+    {
+      "method": "POST",
+      "path": "/api/v1/admin/rust/zones/presets",
+      "tier": "public"
+    },
     {
       "method": "POST",
       "path": "/api/v1/admin/users/:id/rust/permissions/grants",
@@ -305,6 +320,11 @@
       "method": "PUT",
       "path": "/api/v1/admin/rust/voice",
       "tier": "public"
+    },
+    {
+      "method": "PUT",
+      "path": "/api/v1/admin/rust/zones/presets/:id",
+      "tier": "public"
     }
   ]
 }