fix: 修正 logo 中 N 和 G 字母造型

N 添加对角线笔画（█▄ █），G 添加内横杠（█ ▀█），
避免与 O 字母造型雷同。同步更新 ui.ts 中的硬编码 wordmark。

packages/server/src/handlers/command.ts

@@ -0,0 +1,9 @@
+import { CommandV2 } from "@opencode-ai/core/command"
+import { Effect } from "effect"
+import { HttpApiBuilder } from "effect/unstable/httpapi"
+import { Api } from "../api"
+import { response } from "../groups/location"
+
+export const CommandHandler = HttpApiBuilder.group(Api, "server.command", (handlers) =>
+  handlers.handle("command.list", () => response(CommandV2.Service.use((command) => command.list()))),
+)