feat: configurable STUN server fallbacks for WebRTC ICE

The WebRTC transport relied on a single Google STUN server — if it was
unreachable, ICE gathering waited the full 4s timeout. Now four public
servers are used by default (Google ×2, Cloudflare, Mozilla), configurable
via node.toml, the Node page UI, and the CLI (meshbay-node stun list|add|
remove|reset). Changes are hot-swapped on the live transport.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/packages/meshbay-hub/src/meshbay_hub/static/locales/zh-CN.js b/packages/meshbay-hub/src/meshbay_hub/static/locales/zh-CN.js
index da97162..8004868 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/zh-CN.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/zh-CN.js
@@ -724,4 +724,18 @@ export default {
   'wizard.done_message': '您的群组已就绪。您的 node 正在托管它，加密已设置完成。',
   'wizard.go_to_group': '前往群组',
   'wizard.finish_later': '稍后完成设置',
+  'node.stun_servers': 'STUN Servers',
+  'node.stun_hint': 'Servers used for WebRTC NAT traversal (ICE candidate gathering).',
+  'node.stun_add': 'Add',
+  'node.stun_add_placeholder': 'stun:host:port',
+  'node.stun_remove': 'Remove',
+  'node.stun_move_up': 'Move up',
+  'node.stun_move_down': 'Move down',
+  'node.stun_save': 'Save',
+  'node.stun_saving': 'Saving…',
+  'node.stun_saved': 'STUN servers saved.',
+  'node.stun_reset': 'Reset to defaults',
+  'node.stun_empty': 'No STUN servers configured. NAT traversal will not work.',
+  'node.stun_duplicate': 'This server is already in the list.',
+  'node.stun_invalid': 'STUN URL must start with stun:',
 };