feat(shangwutong): sync classifications and update conversations

backend/internal/model/channel_shangwutong_classification_cache.go

@@ -0,0 +1,26 @@
+package model
+
+import (
+	"time"
+
+	"gorm.io/datatypes"
+)
+
+// ShangwutongClassificationCache stores the last successful remote catalog per inbox.
+// It is deliberately separate from native GoChat tags and CRM categories.
+type ShangwutongClassificationCache struct {
+	InboxID            uint           `gorm:"primaryKey" json:"inbox_id"`
+	ConversationKinds  datatypes.JSON `gorm:"type:jsonb;not null;default:'[]'" json:"conversation_kinds"`
+	CustomerColorKinds datatypes.JSON `gorm:"type:jsonb;not null;default:'[]'" json:"customer_color_kinds"`
+	SyncStatus         string         `gorm:"size:20;not null;default:never" json:"sync_status"`
+	SyncedAt           *time.Time     `json:"synced_at,omitempty"`
+	LastErrorCode      *string        `gorm:"size:100" json:"last_error_code,omitempty"`
+	LastErrorMessage   *string        `gorm:"type:text" json:"last_error_message,omitempty"`
+	LastSyncEventID    string         `gorm:"size:128" json:"-"`
+	CreatedAt          time.Time      `json:"created_at"`
+	UpdatedAt          time.Time      `json:"updated_at"`
+}
+
+func (ShangwutongClassificationCache) TableName() string {
+	return "shangwutong_classification_caches"
+}