Merge edge into feat/title-conditions: §3's zone presets

Two conflicts, both additive: schema.sql and purge.sql keep both phases'
tables. Swagger fragment (61 paths) and routes.manifest (67 routes)
regenerated against the pinned core; 455 server and 58 client tests pass.

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

server/router/admin/rust.router.js

@@ -42,6 +42,10 @@ adminRustRouter.use('/config', require('./config.router'))
 // deliberately widens it, fleet-wide or for one server.
 adminRustRouter.use('/visibility', require('./visibility.router'))
 
+// Zone presets (PLAN_REDESIGNS §3.1, D195, D210): the flags and settings a zone
+// step copies, saved by name for one server, several, or the fleet.
+adminRustRouter.use('/zones', require('./zones.router'))
+
 adminRustRouter.get(
   '/servers',
   // #swagger.tags = ['Admin · Rust']