feat(dongchedi): translate platform "server exception" into actionable copy

Map dongchedi adapter failures (raw "server exception" or
dongchedi_platform_exception) to a Chinese prompt steering the user to
the dongchedi backend, so renderer/admin views and desktop-task error
payloads no longer surface the opaque platform message.

server/internal/tenant/app/publish_record_normalize.go

@@ -20,18 +20,26 @@ func normalizePublishRecordForResponse(item *PublishRecordResponse) {
 }
 
 func normalizePublishRecordErrorMessage(platform string, message *string) *string {
-	if strings.TrimSpace(platform) != "baijiahao" || message == nil {
+	normalizedPlatform := strings.TrimSpace(platform)
+	if message == nil || (normalizedPlatform != "baijiahao" && normalizedPlatform != "dongchedi") {
 		return message
 	}
 
 	trimmed := strings.TrimSpace(*message)
-	if trimmed == "baijiahao_challenge_required" ||
+	if normalizedPlatform == "baijiahao" && (trimmed == "baijiahao_challenge_required" ||
 		trimmed == "desktop_account_risk_control" ||
 		trimmed == "desktop_account_challenge_required" ||
-		strings.HasPrefix(trimmed, "baijiahao_challenge_required:") {
+		strings.HasPrefix(trimmed, "baijiahao_challenge_required:")) {
 		normalized := baijiahaoRiskControlPrompt
 		return &normalized
 	}
+	if normalizedPlatform == "dongchedi" && (trimmed == "dongchedi_platform_exception" ||
+		strings.EqualFold(trimmed, "server exception") ||
+		strings.HasPrefix(trimmed, "dongchedi_publish_failed:server exception") ||
+		strings.HasPrefix(trimmed, "dongchedi_draft_failed:server exception")) {
+		normalized := dongchediPlatformExceptionPrompt
+		return &normalized
+	}
 
 	return message
 }

server/internal/tenant/app/publish_record_support.go

@@ -467,6 +467,7 @@ func extractStringPointer(payload map[string]any, keys ...string) *string {
 }
 
 const baijiahaoRiskControlPrompt = "您触发平台风控，请手动发稿一篇并完成验证，方可继续使用"
+const dongchediPlatformExceptionPrompt = "懂车帝平台返回异常，请打开懂车帝后台查看并处理平台提示，确认账号状态后再重试。"
 
 func desktopTaskErrorMessage(payload map[string]any, platform string) *string {
 	if message := desktopTaskPlatformErrorMessage(payload, platform); message != nil {
@@ -485,7 +486,8 @@ func desktopTaskErrorMessage(payload map[string]any, platform string) *string {
 }
 
 func desktopTaskPlatformErrorMessage(payload map[string]any, platform string) *string {
-	if strings.TrimSpace(platform) != "baijiahao" {
+	normalizedPlatform := strings.TrimSpace(platform)
+	if normalizedPlatform != "baijiahao" && normalizedPlatform != "dongchedi" {
 		return nil
 	}
 
@@ -495,13 +497,22 @@ func desktopTaskPlatformErrorMessage(payload map[string]any, platform string) *s
 			continue
 		}
 		trimmed := strings.TrimSpace(*value)
-		if trimmed == "baijiahao_challenge_required" ||
-			trimmed == "desktop_account_risk_control" ||
-			trimmed == "desktop_account_challenge_required" ||
-			strings.HasPrefix(trimmed, "baijiahao_challenge_required:") {
+		if normalizedPlatform == "baijiahao" &&
+			(trimmed == "baijiahao_challenge_required" ||
+				trimmed == "desktop_account_risk_control" ||
+				trimmed == "desktop_account_challenge_required" ||
+				strings.HasPrefix(trimmed, "baijiahao_challenge_required:")) {
 			message := baijiahaoRiskControlPrompt
 			return &message
 		}
+		if normalizedPlatform == "dongchedi" &&
+			(trimmed == "dongchedi_platform_exception" ||
+				strings.EqualFold(trimmed, "server exception") ||
+				strings.HasPrefix(trimmed, "dongchedi_publish_failed:server exception") ||
+				strings.HasPrefix(trimmed, "dongchedi_draft_failed:server exception")) {
+			message := dongchediPlatformExceptionPrompt
+			return &message
+		}
 	}
 
 	return nil

server/internal/tenant/app/publish_record_support_test.go

@@ -43,6 +43,36 @@ func TestDesktopTaskErrorMessageKeepsGenericMessage(t *testing.T) {
 	}
 }
 
+func TestDesktopTaskErrorMessageMapsDongchediServerException(t *testing.T) {
+	tests := []struct {
+		name    string
+		payload map[string]any
+	}{
+		{
+			name: "raw platform message",
+			payload: map[string]any{
+				"message": "server exception",
+			},
+		},
+		{
+			name: "adapter code",
+			payload: map[string]any{
+				"code":    "dongchedi_platform_exception",
+				"message": "懂车帝平台返回异常，请打开懂车帝后台查看并处理平台提示，确认账号状态后再重试。",
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := desktopTaskErrorMessage(tt.payload, "dongchedi")
+			if got == nil || *got != dongchediPlatformExceptionPrompt {
+				t.Fatalf("desktopTaskErrorMessage() = %v, want %q", got, dongchediPlatformExceptionPrompt)
+			}
+		})
+	}
+}
+
 func TestNormalizePublishRecordForResponseUsesBaijiahaoPublicURL(t *testing.T) {
 	articleID := "1863525130677225913"
 	editURL := "https://baijiahao.baidu.com/builder/rc/edit?type=news&article_id=1863525130677225913"
@@ -64,6 +94,20 @@ func TestNormalizePublishRecordForResponseUsesBaijiahaoPublicURL(t *testing.T) {
 	}
 }
 
+func TestNormalizePublishRecordForResponseMapsDongchediServerException(t *testing.T) {
+	rawError := "server exception"
+	item := &PublishRecordResponse{
+		PlatformID:   "dongchedi",
+		ErrorMessage: &rawError,
+	}
+
+	normalizePublishRecordForResponse(item)
+
+	if item.ErrorMessage == nil || *item.ErrorMessage != dongchediPlatformExceptionPrompt {
+		t.Fatalf("ErrorMessage = %v, want %q", item.ErrorMessage, dongchediPlatformExceptionPrompt)
+	}
+}
+
 func TestNormalizePublishRecordForResponseUsesWangyihaoPublicURL(t *testing.T) {
 	articleID := "IK5K461I05561G2M"
 	item := &PublishRecordResponse{