ci: improve CodeQL workflow — add workflow_dispatch + Bun setup

.github/workflows/codeql.yml

@@ -7,6 +7,7 @@ on:
     branches: [main]
   schedule:
     - cron: '30 3 * * 1'  # 每周一 03:30 UTC
+  workflow_dispatch:       # 手动触发
 
 jobs:
   analyze:
@@ -26,6 +27,14 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
 
+      - name: Setup Bun
+        uses: oven-sh/setup-bun@v2
+        with:
+          bun-version: latest
+
+      - name: Install dependencies
+        run: bun install
+
       - name: Initialize CodeQL
         uses: github/codeql-action/init@v3
         with: