fix: 将 Gitea 配置迁移到 ~/.gitea/config.yaml 多账号配置体系

- 新增 _get_gitea_config.py 从 YAML 读取 URL/repo/token
- _common.sh 改为通过 eval python 脚本加载配置
- GITEA_CICD_SETUP.md / DEV_AGENT.md / QE_AGENT.md 更新文档
- CI 工作流改用 ${{ gitea.server_url }} / ${{ gitea.repository }}

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.gitea/workflows/acceptance.yml

@@ -23,7 +23,7 @@ jobs:
     steps:
       - name: Checkout main branch
         run: |
-          git clone --depth 1 https://git.zywl.me/zeekrAI/document_analyzer.git .
+          git clone --depth 1 ${{ gitea.server_url }}/${{ gitea.repository }}.git .
           git checkout main
 
       - name: Install dependencies
@@ -57,6 +57,8 @@ jobs:
           python scripts/create_failure_issue.py \
             --sha "${{ github.sha }}" --branch "main" \
             --run "${{ github.run_number }}" \
+            --gitea-url "${{ gitea.server_url }}" \
+            --repo "${{ gitea.repository }}" \
             --message "QE Acceptance: ${SUMMARY:-pipeline failed}" \
             --workflow "QE Acceptance" \
             --labels "acceptance-failure,agent-task"