✨ 添加定时任务日志管理功能

- 添加用户清空日志按钮
- 添加30天自动清理定时任务执行日志
- 简化日志API代码，移除调试日志

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

templates/index.html

@@ -493,6 +493,7 @@
                 <div id="scheduleLogsList" style="max-height: 400px; overflow-y: auto;"></div>
             </div>
             <div class="modal-footer">
+                <button class="btn btn-text" style="color: var(--md-error);" onclick="clearScheduleLogs()">清空日志</button>
                 <button class="btn btn-primary" onclick="closeModal('scheduleLogsModal')">关闭</button>
             </div>
         </div>
@@ -1312,6 +1313,8 @@
             if (schedule) openScheduleModal(schedule);
         }
 
+        let currentLogsScheduleId = null;
+
         function viewScheduleLogs(scheduleId) {
             const numericId = parseInt(scheduleId, 10);
             const schedule = schedules.find(s => s.id == numericId);
@@ -1320,6 +1323,7 @@
                 return;
             }
 
+            currentLogsScheduleId = numericId;
             document.getElementById("scheduleLogsTitle").textContent = "【" + (schedule.name || "未命名任务") + "】 执行日志";
 
             fetch("/api/schedules/" + numericId + "/logs?limit=20")
@@ -1362,6 +1366,23 @@
                 });
         }
 
+        function clearScheduleLogs() {
+            if (!currentLogsScheduleId) return;
+            if (!confirm('确定要清空该任务的所有执行日志吗？')) return;
+
+            fetch("/api/schedules/" + currentLogsScheduleId + "/logs", { method: 'DELETE' })
+                .then(r => r.json())
+                .then(data => {
+                    if (data.success) {
+                        showToast('已清空 ' + data.deleted + ' 条日志', 'success');
+                        document.getElementById("scheduleLogsList").innerHTML = "<div class=\"empty-state\"><p>暂无执行日志</p></div>";
+                    } else {
+                        showToast(data.error || '清空失败', 'error');
+                    }
+                })
+                .catch(err => showToast('清空失败', 'error'));
+        }
+
         function formatDuration(seconds) {
             if (seconds < 60) return seconds + "秒";
             const minutes = Math.floor(seconds / 60);