build(web): declare the locale dependency for ui-subagent

The client plugin now consumes `ctx.locale` (dictionary registration plus
the slot `t` seat), but the package graph did not know it: no
`dshClient.inject` entry, no peer/devDependency, no tsconfig project
reference. Mirror the ui-conversation convention so the dependency graph,
HMR/preflight metadata, and standalone packaging all recognize the
`@deepseek-ai/dsh-client-locale` seam.

packages/client/ui-subagent/tsconfig.json

@@ -11,6 +11,9 @@
     {
       "path": "../../../vendor/cordis"
     },
+    {
+      "path": "../locale"
+    },
     {
       "path": "../runtime"
     },