chore: harden dependabot updates

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: npm
+    directory: /
+    schedule:
+      interval: weekly
+      day: monday
+      time: "09:00"
+      timezone: Asia/Shanghai
+    open-pull-requests-limit: 5
+    versioning-strategy: increase-if-necessary
+    commit-message:
+      prefix: chore
+      include: scope
+    labels:
+      - dependencies
+      - npm
+    groups:
+      app-dependencies:
+        patterns:
+          - "*"
+
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
+      day: monday
+      time: "09:30"
+      timezone: Asia/Shanghai
+    open-pull-requests-limit: 3
+    commit-message:
+      prefix: chore
+      include: scope
+    labels:
+      - dependencies
+      - github-actions
+    groups:
+      github-actions:
+        patterns:
+          - "*"

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Set up pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 10.32.1
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: pnpm
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Audit production dependencies
+        run: pnpm audit --prod --audit-level=high
+
+      - name: Build Nitro app
+        run: pnpm build

.github/workflows/dependabot-auto-merge.yml

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+name: Dependabot Auto Merge
+
+on:
+  pull_request:
+    types:
+      - opened
+      - synchronize
+      - reopened
+      - labeled
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  enable-automerge:
+    if: github.event.pull_request.user.login == 'dependabot[bot]'
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+
+    steps:
+      - name: Fetch Dependabot metadata
+        id: metadata
+        uses: dependabot/fetch-metadata@d7267f607e9d3fb96fc2fbe83e0af444713e90b7
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Enable auto-merge for patch updates
+        if: |
+          (github.event.pull_request.base.ref == 'main') &&
+          (
+            steps.metadata.outputs.update-type == 'version-update:semver-patch' ||
+            steps.metadata.outputs.update-type == 'security:update'
+          )
+        run: gh pr merge --auto --merge "$PR_URL"
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          PR_URL: ${{ github.event.pull_request.html_url }}