diff --git a/internal/logic/billing/scope.go b/internal/logic/billing/scope.go
index 02b5716..34bef8b 100644
--- a/internal/logic/billing/scope.go
+++ b/internal/logic/billing/scope.go
@@ -25,13 +25,13 @@ func CheckScope(scope string, relayMode string) bool {
 	case ScopeReadOnly:
 		// read_only 仅允许 GET /models
 		return relayMode == ""
-	case ScopeChatOnly:
+	case ScopeChatOnly, "chat":
 		return relayMode == "chat_completions" || relayMode == "completions" || relayMode == "claude_messages"
-	case ScopeEmbeddingsOnly:
+	case ScopeEmbeddingsOnly, "embedding":
 		return relayMode == "embeddings"
-	case ScopeImagesOnly:
+	case ScopeImagesOnly, "image":
 		return relayMode == "images_generations"
-	case ScopeAudioOnly:
+	case ScopeAudioOnly, "audio":
 		return relayMode == "audio" || relayMode == "tts" || relayMode == "stt"
 	default:
 		// custom scope: 以逗号分隔的模式列表
diff --git a/internal/logic/billing/scope_test.go b/internal/logic/billing/scope_test.go
index cda6fad..948b38a 100644
--- a/internal/logic/billing/scope_test.go
+++ b/internal/logic/billing/scope_test.go
@@ -27,6 +27,18 @@ func TestCheckScope(t *testing.T) {
 		{"read_only allows empty mode (models GET)", ScopeReadOnly, "", true},
 		{"audio_only allows audio", ScopeAudioOnly, "audio", true},
 		{"audio_only denies chat", ScopeAudioOnly, "chat_completions", false},
+		// short alias scope names (sent by frontend)
+		{"chat alias allows chat_completions", "chat", "chat_completions", true},
+		{"chat alias allows completions", "chat", "completions", true},
+		{"chat alias allows claude_messages", "chat", "claude_messages", true},
+		{"chat alias denies embeddings", "chat", "embeddings", false},
+		{"embedding alias allows embeddings", "embedding", "embeddings", true},
+		{"embedding alias denies chat", "embedding", "chat_completions", false},
+		{"image alias allows images_generations", "image", "images_generations", true},
+		{"image alias denies chat", "image", "chat_completions", false},
+		{"audio alias allows audio", "audio", "audio", true},
+		{"audio alias allows tts", "audio", "tts", true},
+		{"audio alias denies chat", "audio", "chat_completions", false},
 	}
 
 	for _, tt := range tests {
diff --git a/internal/logic/relay/provider.go b/internal/logic/relay/provider.go
index d2a4128..857e9a0 100644
--- a/internal/logic/relay/provider.go
+++ b/internal/logic/relay/provider.go
@@ -402,7 +402,8 @@ func (p *DataProviderImpl) RecordAudit(ctx context.Context, record *common.Audit
 		tntReq, tntResp = truncateBody(tntReq, maxBodyLen), truncateBody(tntResp, maxBodyLen)
 
 		// 仅审计级别为 all 时记录请求头和响应头
-		var requestHeadersJSON, responseHeadersJSON string
+		requestHeadersJSON := "null"
+		responseHeadersJSON := "null"
 		if globalLevel == lcommon.AuditLevelFull {
 			if record.RequestHeaders != nil {
 				b, _ := json.Marshal(record.RequestHeaders)
@@ -415,7 +416,7 @@ func (p *DataProviderImpl) RecordAudit(ctx context.Context, record *common.Audit
 		}
 
 		// 序列化转发路径追踪
-		var forwardingTraceJSON string
+		forwardingTraceJSON := "null"
 		if record.ForwardingTrace != nil {
 			if b, err := json.Marshal(record.ForwardingTrace); err == nil {
 				forwardingTraceJSON = string(b)