ci(workflow): 移除不再需要的自动合并工作流

删除针对 tabbar 和 spa 分支的自动合并工作流配置，仅保留 i18n 分支的配置

.github/workflows/auto-merge.yml

@@ -24,39 +24,3 @@ jobs:
           git checkout i18n
           git merge main --no-ff -m "Auto merge main into i18n"
           git push origin i18n
-
-  merge-to-tabbar:
-    name: Merge main into tabbar
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-        with:
-          fetch-depth: 0
-          token: ${{ secrets.GH_TOKEN_AUTO_MERGE }}
-
-      - name: Merge main into tabbar
-        run: |
-          git config user.name "GitHub Actions"
-          git config user.email "actions@github.com"
-          git checkout tabbar
-          git merge main --no-ff -m "Auto merge main into tabbar"
-          git push origin tabbar
-
-  merge-to-spa:
-    name: Merge main into spa
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-        with:
-          fetch-depth: 0
-          token: ${{ secrets.GH_TOKEN_AUTO_MERGE }}
-
-      - name: Merge main into spa
-        run: |
-          git config user.name "GitHub Actions"
-          git config user.email "actions@github.com"
-          git checkout spa
-          git merge main --no-ff -m "Auto merge main into spa"
-          git push origin spa