Version: 0.9.77.dev.260505

后端：
1.阶段 6 CP4/CP5 目录收口与共享边界纯化
- 将 backend 根目录收口为 services、client、gateway、cmd、shared 五个一级目录
- 收拢 bootstrap、inits、infra/kafka、infra/outbox、conv、respond、pkg、middleware，移除根目录旧实现与空目录
- 将 utils 下沉到 services/userauth/internal/auth，将 logic 下沉到 services/schedule/core/planning
- 将迁移期 runtime 桥接实现统一收拢到 services/runtime/{conv,dao,eventsvc,model}，删除 shared/legacy 与未再被 import 的旧 service 实现
- 将 gateway/shared/respond 收口为 HTTP/Gin 错误写回适配，shared/respond 仅保留共享错误语义与状态映射
- 将 HTTP IdempotencyMiddleware 与 RateLimitMiddleware 收口到 gateway/middleware
- 将 GormCachePlugin 下沉到 shared/infra/gormcache，将共享 RateLimiter 下沉到 shared/infra/ratelimit，将 agent token budget 下沉到 services/agent/shared
- 删除 InitEino 兼容壳，收缩 cmd/internal/coreinit 仅保留旧组合壳残留域初始化语义
- 更新微服务迁移计划与桌面 checklist，补齐 CP4/CP5 当前切流点、目录终态与验证结果
- 完成 go test ./...、git diff --check 与最终真实 smoke；health、register/login、task/create+get、schedule/today、task-class/list、memory/items、agent chat/meta/timeline/context-stats 全部 200，SSE 合并结果为 CP5_OK 且 [DONE] 只有 1 个

backend/services/course/dao/connect.go

@@ -3,8 +3,7 @@ package dao
 import (
 	"fmt"
 
-	"github.com/spf13/viper"
-	"gorm.io/driver/mysql"
+	mysqlinfra "github.com/LoveLosita/smartflow/backend/shared/infra/mysql"
 	"gorm.io/gorm"
 )
 
@@ -15,18 +14,7 @@ import (
 // 2. 本函数不 AutoMigrate schedule 表，避免 course 进程越权管理 schedule schema；
 // 3. 启动期只检查运行时依赖表是否存在，缺表时尽早失败。
 func OpenDBFromConfig() (*gorm.DB, error) {
-	host := viper.GetString("database.host")
-	port := viper.GetString("database.port")
-	user := viper.GetString("database.user")
-	password := viper.GetString("database.password")
-	dbname := viper.GetString("database.dbname")
-
-	dsn := fmt.Sprintf(
-		"%s:%s@tcp(%s:%s)/%s?charset=utf8mb4&parseTime=True&loc=Local",
-		user, password, host, port, dbname,
-	)
-
-	db, err := gorm.Open(mysql.Open(dsn), &gorm.Config{})
+	db, err := mysqlinfra.OpenDBFromConfig()
 	if err != nil {
 		return nil, err
 	}

backend/services/course/dao/course.go

@@ -3,7 +3,7 @@ package dao
 import (
 	"context"
 
-	"github.com/LoveLosita/smartflow/backend/model"
+	"github.com/LoveLosita/smartflow/backend/services/runtime/model"
 	"gorm.io/gorm"
 )
 

backend/services/course/rpc/errors.go

@@ -5,8 +5,8 @@ import (
 	"log"
 	"strings"
 
-	"github.com/LoveLosita/smartflow/backend/respond"
 	coursesv "github.com/LoveLosita/smartflow/backend/services/course/sv"
+	"github.com/LoveLosita/smartflow/backend/shared/respond"
 	"google.golang.org/genproto/googleapis/rpc/errdetails"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"

backend/services/course/rpc/handler.go

@@ -5,11 +5,11 @@ import (
 	"encoding/json"
 	"errors"
 
-	"github.com/LoveLosita/smartflow/backend/model"
-	"github.com/LoveLosita/smartflow/backend/respond"
 	"github.com/LoveLosita/smartflow/backend/services/course/rpc/pb"
 	coursesv "github.com/LoveLosita/smartflow/backend/services/course/sv"
+	"github.com/LoveLosita/smartflow/backend/services/runtime/model"
 	coursecontracts "github.com/LoveLosita/smartflow/backend/shared/contracts/course"
+	"github.com/LoveLosita/smartflow/backend/shared/respond"
 )
 
 type Handler struct {

backend/services/course/sv/course.go

@@ -4,12 +4,12 @@ import (
 	"context"
 	"strings"
 
-	"github.com/LoveLosita/smartflow/backend/conv"
-	rootdao "github.com/LoveLosita/smartflow/backend/dao"
-	"github.com/LoveLosita/smartflow/backend/model"
-	"github.com/LoveLosita/smartflow/backend/respond"
 	coursedao "github.com/LoveLosita/smartflow/backend/services/course/dao"
 	llmservice "github.com/LoveLosita/smartflow/backend/services/llm"
+	"github.com/LoveLosita/smartflow/backend/services/runtime/conv"
+	rootdao "github.com/LoveLosita/smartflow/backend/services/runtime/dao"
+	"github.com/LoveLosita/smartflow/backend/services/runtime/model"
+	"github.com/LoveLosita/smartflow/backend/shared/respond"
 )
 
 type CourseService struct {

backend/services/course/sv/course_parse.go

@@ -6,7 +6,7 @@ import (
 	"net/http"
 	"strings"
 
-	"github.com/LoveLosita/smartflow/backend/model"
+	"github.com/LoveLosita/smartflow/backend/services/runtime/model"
 )
 
 const (

backend/services/course/sv/course_parse_ark.go

@@ -8,8 +8,8 @@ import (
 	"strings"
 	"time"
 
-	"github.com/LoveLosita/smartflow/backend/model"
 	llmservice "github.com/LoveLosita/smartflow/backend/services/llm"
+	"github.com/LoveLosita/smartflow/backend/services/runtime/model"
 )
 
 // ParseCourseTableImage 使用 Ark SDK Responses 解析课程表图片。