fix(agent): 观测缓冲去重纳入 cache_status 并保留原始 -

避免同一请求不同缓存状态被合并丢弃；OpenResty 的 - 原样入库便于详情区分。

internal/apps/agent/observability/traffic.go

@@ -205,11 +205,8 @@ func parseJSONAccessLogRecord(raw string) (parsedAccessLogRecord, bool) {
 }
 
 func normalizeCacheStatus(value string) string {
-	trimmed := strings.TrimSpace(value)
-	if trimmed == "-" {
-		return ""
-	}
-	return trimmed
+	// Keep OpenResty "-" as-is so details can distinguish it from a missing field.
+	return strings.TrimSpace(value)
 }
 
 func parseCombinedAccessLogRecord(raw string) (parsedAccessLogRecord, bool) {

internal/apps/agent/observability/traffic_test.go

@@ -56,6 +56,18 @@ func TestCollectAccessLogsReturnsFactsOnly(t *testing.T) {
 	}
 }
 
+func TestNormalizeCacheStatusKeepsDash(t *testing.T) {
+	if got := normalizeCacheStatus(" - "); got != "-" {
+		t.Fatalf("normalizeCacheStatus dash = %q, want -", got)
+	}
+	if got := normalizeCacheStatus(" HIT "); got != "HIT" {
+		t.Fatalf("normalizeCacheStatus hit = %q, want HIT", got)
+	}
+	if got := normalizeCacheStatus(""); got != "" {
+		t.Fatalf("normalizeCacheStatus empty = %q, want empty", got)
+	}
+}
+
 func TestCollectAccessLogsResetsOffsetAfterTruncate(t *testing.T) {
 	tempDir := t.TempDir()
 	logPath := filepath.Join(tempDir, "openflare_access.log")