feat: 实现用户注册功能，包括数据库表结构、gRPC 服务和业务逻辑

backend/services/user-svc/internal/domain/user.go

@@ -0,0 +1,42 @@
+package domain
+
+import (
+	"time"
+
+	"github.com/google/uuid"
+)
+
+type User struct {
+	ID         uuid.UUID `json:"id"`
+	Deleted    bool      `json:"deleted"`
+	CreateTime time.Time `json:"create_time"`
+	UpdateTime time.Time `json:"update_time"`
+}
+
+type UserLoginAccount struct {
+	ID         uuid.UUID `json:"id"`
+	UserID     uuid.UUID `json:"user_id"`
+	Account    string    `json:"account"`
+	Deleted    bool      `json:"deleted"`
+	CreateTime time.Time `json:"create_time"`
+	UpdateTime time.Time `json:"update_time"`
+}
+
+type UserLoginPassword struct {
+	ID         uuid.UUID `json:"id"`
+	UserID     uuid.UUID `json:"user_id"`
+	Password   string    `json:"password"`
+	Deleted    bool      `json:"deleted"`
+	CreateTime time.Time `json:"create_time"`
+	UpdateTime time.Time `json:"update_time"`
+}
+
+type RegisterRequest struct {
+	Account  string `json:"account" binding:"required"`
+	Password string `json:"password" binding:"required,min=6"`
+}
+
+type RegisterResponse struct {
+	UserID uuid.UUID `json:"user_id"`
+	Account string    `json:"account"`
+}