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。

.github/workflows/notify-discord.yml

@@ -0,0 +1,14 @@
+name: notify-discord
+
+on:
+  release:
+    types: [released] # fires when a draft release is published
+
+jobs:
+  notify:
+    runs-on: blacksmith-4vcpu-ubuntu-2404
+    steps:
+      - name: Send nicely-formatted embed to Discord
+        uses: SethCohen/github-releases-to-discord@24d166886aee4646d448c8a389ff9e1ebcab3682 # v1.20.0
+        with:
+          webhook_url: ${{ secrets.DISCORD_WEBHOOK }}