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/package.json

@@ -0,0 +1,20 @@
+{
+  "name": "github",
+  "module": "index.ts",
+  "type": "module",
+  "private": true,
+  "license": "MIT",
+  "devDependencies": {
+    "@types/bun": "catalog:"
+  },
+  "peerDependencies": {
+    "typescript": "^5"
+  },
+  "dependencies": {
+    "@actions/core": "1.11.1",
+    "@actions/github": "6.0.1",
+    "@octokit/graphql": "9.0.1",
+    "@octokit/rest": "catalog:",
+    "@opencode-ai/sdk": "workspace:*"
+  }
+}