Restore macOS direct LAN connections (#3071)

* fix(desktop): restore direct LAN connections

Desktop 0.3.0 routed remote WebSockets through the Electron main process, causing previously working macOS LAN connections to fail with EHOSTUNREACH. Revert custom direct headers and restore the renderer WebSocket path used before the regression.

* fix(app): replace host connections by identity

Keep one connection per stable ID when TLS or password settings change. This preserves the current-main upsert invariant while the custom-header rollback removes the unrelated transport feature.

packages/app/src/i18n/resources/zh-CN.ts

@@ -1409,19 +1409,6 @@ export const zhCN: TranslationResources = {
         show: "显示高级选项",
         hide: "隐藏高级选项",
       },
-      headers: {
-        title: "自定义请求头",
-        add: "添加请求头",
-        name: "名称",
-        value: "值",
-        remove: "删除请求头",
-        errors: {
-          missingName: "请为每个请求头输入名称",
-          invalidName: "{{name}} 不是有效的请求头名称",
-          invalidValue: "{{name}} 包含无效换行符",
-          duplicateName: "{{name}} 输入了多次",
-        },
-      },
       passwordVisibility: {
         show: "显示密码",
         hide: "隐藏密码",