feat(admin): establish core data model

admin/internal/domain/submission.go

@@ -0,0 +1,56 @@
+package domain
+
+import (
+	"errors"
+	"time"
+)
+
+var ErrInvalidSubmissionTransition = errors.New("invalid submission status transition")
+
+type SubmissionStatus string
+
+const (
+	SubmissionStatusFenced                 SubmissionStatus = "FENCED"
+	SubmissionStatusSubmitted              SubmissionStatus = "SUBMITTED"
+	SubmissionStatusReconciliationRequired SubmissionStatus = "RECONCILIATION_REQUIRED"
+	SubmissionStatusManualResolved         SubmissionStatus = "MANUAL_RESOLVED"
+)
+
+type OrderSubmission struct {
+	ID                string
+	TaskID            string
+	AuthorizationID   string
+	CommandID         string
+	DryRunID          string
+	Status            SubmissionStatus
+	VerifiedUnitPrice string
+	QuantityRead      int
+	ConfirmPageAmount string
+	CreatedAt         time.Time
+	ResolvedAt        *time.Time
+}
+
+// CanTransitionTo 只允许围栏记录向最终观察结果调和，拒绝回退以防触发第二次真实动作。
+func (status SubmissionStatus) CanTransitionTo(next SubmissionStatus) bool {
+	_, allowed := submissionTransitions[status][next]
+	return allowed
+}
+
+// TransitionSubmission 返回下一状态；未定义的提交记录状态转移一律失败。
+func TransitionSubmission(current, next SubmissionStatus) (SubmissionStatus, error) {
+	if !current.CanTransitionTo(next) {
+		return current, ErrInvalidSubmissionTransition
+	}
+
+	return next, nil
+}
+
+var submissionTransitions = map[SubmissionStatus]map[SubmissionStatus]struct{}{
+	SubmissionStatusFenced: {
+		SubmissionStatusSubmitted:              {},
+		SubmissionStatusReconciliationRequired: {},
+	},
+	SubmissionStatusReconciliationRequired: {
+		SubmissionStatusManualResolved: {},
+	},
+}