fix: allow device-paired clients to retrieve TTS API keys (#14613)

* refactor: add config.get to READ_METHODS set

* refactor(gateway): scope talk secrets via talk.config

* fix: resolve rebase conflicts for talk scope refactor

---------

Co-authored-by: Peter Steinberger <steipete@gmail.com>

src/gateway/server-methods.ts

@@ -72,6 +72,8 @@ const READ_METHODS = new Set([
   "node.list",
   "node.describe",
   "chat.history",
+  "config.get",
+  "talk.config",
 ]);
 const WRITE_METHODS = new Set([
   "send",