feat(agent): 经验记忆 - 按任务相关度排序召回，并过期清理待批准记忆

召回按主题、情境和中文双字命中加权；30天未处理的待批准记忆会在记录和压缩调度时过期，成功计数写入运行态以免事件窗口截断后误拦。

backend/internal/app/cloud_agent_runtime_tools.go

@@ -16,6 +16,14 @@ import (
 )
 
 func cloudAgentToolResult(runID string, state *cloudAgentRuntime, call cloudAgentCall, result any, err error) bool {
+	if state != nil && err == nil {
+		if cloudAgentLessonToolEligible(call.Function.Name) {
+			state.LessonEligibleToolSuccesses++
+		}
+		if call.Function.Name == "remember_lesson" {
+			state.RememberLessonSuccesses++
+		}
+	}
 	payload := map[string]any{"toolName": call.Function.Name, "callId": call.ID, "arguments": call.Function.Arguments}
 	if call.Function.Name == "skill_read_file" {
 		var args struct {