ci: 修复auto-merge 405连续失败问题 (#539)

Co-authored-by: xiaoxia <dev@xiaoxiajianji.com>
Co-committed-by: xiaoxia <dev@xiaoxiajianji.com>

.gitea/workflows/auto-merge.yml

@@ -66,7 +66,7 @@ jobs:
 
           # 405连续计数器：连续多次合并返回405才放弃
           MERGE_405_COUNT=0
-          MAX_405_RETRIES=6
+          MAX_405_RETRIES=10
 
           # 轮询等待，最多30分钟（180次x10秒）
           for attempt in $(seq 1 180); do
@@ -103,6 +103,8 @@ jobs:
             if [ "$ALL_SUCCESS" = "true" ] && [ "$HAS_APPROVAL" = "true" ]; then
               echo
               echo "CI全绿 + 审批通过，执行自动合并"
+              echo "等待60秒冷却，给Gitea内部状态同步时间..."
+              sleep 60
 
               # 幂等检查：PR是否还是open
               PR_STATE=$(curl -s -H "Authorization: token ${MERGE_TOKEN}" \
@@ -133,14 +135,16 @@ jobs:
                 cat /tmp/merge_resp.json 2>/dev/null || true
                 echo
                 if [ "$MERGE_405_COUNT" -ge "$MAX_405_RETRIES" ]; then
-                  echo "❌ 连续${MAX_405_RETRIES}次合并返回405，放弃自动合并"
+                  echo "⚠️  连续${MAX_405_RETRIES}次合并返回405，放弃自动合并（需人工确认，非代码问题）"
                   curl -s -X POST \
                     -H "Authorization: token ${MERGE_TOKEN}" \
                     -H "Content-Type: application/json" \
-                    -d '{"body": "Auto merge failed after multiple 405 errors: PR may have conflicts or unresolved checks. Please review manually."}' \
+                    -d '{"body": "Auto merge skipped after multiple 405 errors: PR may have conflicts or unresolved checks. Please review manually. This is not a CI failure."}' \
                     "${GITHUB_API_URL}/repos/${GITHUB_REPOSITORY}/issues/${PR_NUMBER}/comments" > /dev/null 2>&1 || true
-                  exit 1
+                  exit 0
                 fi
+                sleep 30
+                continue
               else
                 echo "自动合并失败 (HTTP $HTTP_CODE)"
                 cat /tmp/merge_resp.json 2>/dev/null || true