Version: 0.9.65.dev.260503

后端：
1. 阶段 1.5/1.6
收口 llm-service / rag-service，统一模型出口与检索基础设施入口，清退 backend/infra/llm 与 backend/infra/rag 旧实现；
2. 同步更新相关调用链与微服务迁移计划文档

backend/memory/service/read_scope.go

@@ -3,8 +3,8 @@ package service
 import (
 	"time"
 
-	infrarag "github.com/LoveLosita/smartflow/backend/infra/rag"
 	memorymodel "github.com/LoveLosita/smartflow/backend/memory/model"
+	ragservice "github.com/LoveLosita/smartflow/backend/services/rag"
 )
 
 // buildReadScopedItemQuery 构造读侧统一使用的 MySQL 查询条件。
@@ -53,8 +53,8 @@ func buildReadScopedRAGRequest(
 	req memorymodel.RetrieveRequest,
 	topK int,
 	threshold float64,
-) infrarag.MemoryRetrieveRequest {
-	return infrarag.MemoryRetrieveRequest{
+) ragservice.MemoryRetrieveRequest {
+	return ragservice.MemoryRetrieveRequest{
 		Query:          req.Query,
 		TopK:           topK,
 		Threshold:      threshold,