ci(dependabot): 配置依赖自动更新和自动合并

.github/dependabot.yml

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+version: 2
+
+updates:
+  - package-ecosystem: npm
+    directory: /
+    target-branch: main
+    schedule:
+      interval: weekly
+      day: monday
+      time: '09:00'
+      timezone: Asia/Shanghai
+    open-pull-requests-limit: 10
+    labels:
+      - dependencies
+      - npm
+    commit-message:
+      prefix: chore
+      include: scope
+    groups:
+      security-updates:
+        applies-to: security-updates
+        patterns:
+          - '*'
+      npm-minor-patch:
+        applies-to: version-updates
+        patterns:
+          - '*'
+        update-types:
+          - minor
+          - patch
+
+  - package-ecosystem: github-actions
+    directory: /
+    target-branch: main
+    schedule:
+      interval: weekly
+      day: monday
+      time: '09:15'
+      timezone: Asia/Shanghai
+    open-pull-requests-limit: 10
+    labels:
+      - dependencies
+      - github-actions
+    commit-message:
+      prefix: ci
+      include: scope
+    groups:
+      security-updates:
+        applies-to: security-updates
+        patterns:
+          - '*'
+      github-actions-minor-patch:
+        applies-to: version-updates
+        patterns:
+          - '*'
+        update-types:
+          - minor
+          - patch

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

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+name: Dependabot Auto Merge
+
+on:
+  pull_request:
+    types:
+      - opened
+      - synchronize
+      - reopened
+
+permissions:
+  contents: write
+  pull-requests: write
+
+concurrency:
+  group: dependabot-auto-merge-${{ github.event.pull_request.number }}
+  cancel-in-progress: true
+
+jobs:
+  auto_merge:
+    if: github.event.pull_request.user.login == 'dependabot[bot]'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Fetch Dependabot metadata
+        id: metadata
+        uses: dependabot/fetch-metadata@d7267f607e9d3fb96fc2fbe83e0af444713e90b7
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Enable auto-merge for patch and minor updates
+        if: |
+          steps.metadata.outputs.update-type == 'version-update:semver-patch' ||
+          steps.metadata.outputs.update-type == 'version-update:semver-minor'
+        run: gh pr merge --auto --merge "$PR_URL"
+        env:
+          PR_URL: ${{ github.event.pull_request.html_url }}
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Keep major updates for manual review
+        if: steps.metadata.outputs.update-type == 'version-update:semver-major'
+        run: echo "Major version update detected. Auto-merge is intentionally disabled."