Version: 0.9.72.dev.260505

后端：
1.task-class 服务边界落地
- 新增 cmd/task-class 独立进程入口，落地 services/task_class dao/rpc/sv
- 新增 gateway/client/taskclass、shared/contracts/taskclass 和 shared/ports task-class port
- 将 /api/v1/task-class/* HTTP 门面切到 task-class zrpc，gateway 只保留鉴权、幂等、参数绑定和响应透传
- 保留 task-class 迁移期直写 schedule_events / schedules 权限，维持 insert/apply 与 item 状态更新的本地事务语义
- 修复 task-class 删除已排入日程任务块时 schedules / schedule_events 的外键删除顺序
- 补充 taskClass.rpc 示例配置与阶段 5 文档基线、切流点、残留依赖和 smoke 记录
- 忽略根目录 .tmp 临时烟测产物

backend/gateway/client/taskclass/client.go

@@ -0,0 +1,154 @@
+package taskclass
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"strings"
+	"time"
+
+	taskclasspb "github.com/LoveLosita/smartflow/backend/services/task_class/rpc/pb"
+	taskclasscontracts "github.com/LoveLosita/smartflow/backend/shared/contracts/taskclass"
+	"github.com/zeromicro/go-zero/zrpc"
+	"google.golang.org/grpc"
+)
+
+const (
+	defaultEndpoint = "127.0.0.1:9086"
+	defaultTimeout  = 6 * time.Second
+)
+
+type ClientConfig struct {
+	Endpoints []string
+	Target    string
+	Timeout   time.Duration
+}
+
+// Client 是 gateway 访问 task-class zrpc 的最小适配层。
+//
+// 职责边界：
+// 1. 只负责跨进程 gRPC 调用和 JSON 透传，不触碰 DAO 或迁移期 schedule 直写细节；
+// 2. HTTP 入参仍由 gateway/api 做基础绑定，业务校验交给 task-class 服务；
+// 3. 复杂响应不在 gateway 重建模型，避免 DTO 复制扩散。
+type Client struct {
+	rpc taskclasspb.TaskClassClient
+}
+
+func NewClient(cfg ClientConfig) (*Client, error) {
+	timeout := cfg.Timeout
+	if timeout <= 0 {
+		timeout = defaultTimeout
+	}
+	endpoints := normalizeEndpoints(cfg.Endpoints)
+	target := strings.TrimSpace(cfg.Target)
+	if len(endpoints) == 0 && target == "" {
+		endpoints = []string{defaultEndpoint}
+	}
+
+	zclient, err := zrpc.NewClient(zrpc.RpcClientConf{
+		Endpoints: endpoints,
+		Target:    target,
+		NonBlock:  true,
+		Timeout:   int64(timeout / time.Millisecond),
+	})
+	if err != nil {
+		return nil, err
+	}
+	client := &Client{rpc: taskclasspb.NewTaskClassClient(zclient.Conn())}
+	if err := client.ping(timeout); err != nil {
+		return nil, err
+	}
+	return client, nil
+}
+
+func (c *Client) AddTaskClass(ctx context.Context, req taskclasscontracts.UpsertTaskClassRequest) (json.RawMessage, error) {
+	resp, err := c.callJSON(ctx, c.rpc.AddTaskClass, req)
+	return jsonFromResponse(resp, err)
+}
+
+func (c *Client) ListTaskClasses(ctx context.Context, userID int) (json.RawMessage, error) {
+	resp, err := c.callJSON(ctx, c.rpc.ListTaskClasses, taskclasscontracts.UserRequest{UserID: userID})
+	return jsonFromResponse(resp, err)
+}
+
+func (c *Client) GetTaskClass(ctx context.Context, req taskclasscontracts.GetTaskClassRequest) (json.RawMessage, error) {
+	resp, err := c.callJSON(ctx, c.rpc.GetTaskClass, req)
+	return jsonFromResponse(resp, err)
+}
+
+func (c *Client) UpdateTaskClass(ctx context.Context, req taskclasscontracts.UpsertTaskClassRequest) (json.RawMessage, error) {
+	resp, err := c.callJSON(ctx, c.rpc.UpdateTaskClass, req)
+	return jsonFromResponse(resp, err)
+}
+
+func (c *Client) InsertTaskClassItemIntoSchedule(ctx context.Context, req taskclasscontracts.InsertTaskClassItemIntoScheduleRequest) (json.RawMessage, error) {
+	resp, err := c.callJSON(ctx, c.rpc.InsertTaskClassItemIntoSchedule, req)
+	return jsonFromResponse(resp, err)
+}
+
+func (c *Client) DeleteTaskClassItem(ctx context.Context, req taskclasscontracts.DeleteTaskClassItemRequest) (json.RawMessage, error) {
+	resp, err := c.callJSON(ctx, c.rpc.DeleteTaskClassItem, req)
+	return jsonFromResponse(resp, err)
+}
+
+func (c *Client) DeleteTaskClass(ctx context.Context, req taskclasscontracts.DeleteTaskClassRequest) (json.RawMessage, error) {
+	resp, err := c.callJSON(ctx, c.rpc.DeleteTaskClass, req)
+	return jsonFromResponse(resp, err)
+}
+
+func (c *Client) ApplyBatchIntoSchedule(ctx context.Context, req taskclasscontracts.ApplyBatchIntoScheduleRequest) (json.RawMessage, error) {
+	resp, err := c.callJSON(ctx, c.rpc.ApplyBatchIntoSchedule, req)
+	return jsonFromResponse(resp, err)
+}
+
+func (c *Client) ensureReady() error {
+	if c == nil || c.rpc == nil {
+		return errors.New("task-class zrpc client is not initialized")
+	}
+	return nil
+}
+
+func (c *Client) ping(timeout time.Duration) error {
+	if err := c.ensureReady(); err != nil {
+		return err
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), timeout)
+	defer cancel()
+	_, err := c.rpc.Ping(ctx, &taskclasspb.StatusResponse{})
+	return responseFromRPCError(err)
+}
+
+func (c *Client) callJSON(ctx context.Context, fn func(context.Context, *taskclasspb.JSONRequest, ...grpc.CallOption) (*taskclasspb.JSONResponse, error), payload any) (*taskclasspb.JSONResponse, error) {
+	if err := c.ensureReady(); err != nil {
+		return nil, err
+	}
+	raw, err := json.Marshal(payload)
+	if err != nil {
+		return nil, err
+	}
+	return fn(ctx, &taskclasspb.JSONRequest{PayloadJson: raw})
+}
+
+func jsonFromResponse(resp *taskclasspb.JSONResponse, rpcErr error) (json.RawMessage, error) {
+	if rpcErr != nil {
+		return nil, responseFromRPCError(rpcErr)
+	}
+	if resp == nil {
+		return nil, errors.New("task-class zrpc service returned empty JSON response")
+	}
+	if len(resp.DataJson) == 0 {
+		return json.RawMessage("null"), nil
+	}
+	return json.RawMessage(resp.DataJson), nil
+}
+
+func normalizeEndpoints(values []string) []string {
+	endpoints := make([]string, 0, len(values))
+	for _, value := range values {
+		trimmed := strings.TrimSpace(value)
+		if trimmed != "" {
+			endpoints = append(endpoints, trimmed)
+		}
+	}
+	return endpoints
+}