chore(git): remove legacy gitea sync workflow

.github/workflows/sync-from-gitea.yml

@@ -1,36 +0,0 @@
-name: Sync from Gitea
-
-# 1. 给 GITHUB_TOKEN 开写权限
-permissions:
-  contents: write
-
-on:
-  schedule:
-    - cron: '*/30 * * * *'
-  workflow_dispatch:
-
-jobs:
-  sync:
-    runs-on: ubuntu-latest
-    steps:
-      - name: 配置 Git 用户
-        run: |
-          git config --global user.name "Gitea Sync Bot"
-          git config --global user.email "slhafzjw@slhaf.work"
-
-      - name: 关闭全局 SSL 校验
-        run: git config --global http.sslVerify false
-
-      - name: Clone from Gitea (mirror)
-        run: |
-          git clone --mirror \
-            https://${{ secrets.GITEA_USER }}:${{ secrets.GITEA_TOKEN }}@${{ secrets.GITEA_URL }} \
-            gitea-mirror
-
-      - name: Push to GitHub
-        run: |
-          cd gitea-mirror
-          # 明确推到名为 "github" 的 remote
-          git remote add github \
-            https://${{ github.repository_owner }}:${{ secrets.GITHUB_TOKEN }}@github.com/${{ github.repository }}.git
-          git push --mirror github