fix: 简易模式仅提升管理员默认并发到30

backend/internal/setup/setup_test.go

@@ -1,6 +1,10 @@
 package setup
 
-import "testing"
+import (
+	"os"
+	"strings"
+	"testing"
+)
 
 func TestDecideAdminBootstrap(t *testing.T) {
 	t.Parallel()
@@ -49,3 +53,37 @@ func TestDecideAdminBootstrap(t *testing.T) {
 		})
 	}
 }
+
+func TestSetupDefaultAdminConcurrency(t *testing.T) {
+	t.Run("simple mode admin uses higher concurrency", func(t *testing.T) {
+		t.Setenv("RUN_MODE", "simple")
+		if got := setupDefaultAdminConcurrency(); got != simpleModeAdminConcurrency {
+			t.Fatalf("setupDefaultAdminConcurrency()=%d, want %d", got, simpleModeAdminConcurrency)
+		}
+	})
+
+	t.Run("standard mode keeps existing default", func(t *testing.T) {
+		t.Setenv("RUN_MODE", "standard")
+		if got := setupDefaultAdminConcurrency(); got != defaultUserConcurrency {
+			t.Fatalf("setupDefaultAdminConcurrency()=%d, want %d", got, defaultUserConcurrency)
+		}
+	})
+}
+
+func TestWriteConfigFileKeepsDefaultUserConcurrency(t *testing.T) {
+	t.Setenv("RUN_MODE", "simple")
+	t.Setenv("DATA_DIR", t.TempDir())
+
+	if err := writeConfigFile(&SetupConfig{}); err != nil {
+		t.Fatalf("writeConfigFile() error = %v", err)
+	}
+
+	data, err := os.ReadFile(GetConfigFilePath())
+	if err != nil {
+		t.Fatalf("ReadFile() error = %v", err)
+	}
+
+	if !strings.Contains(string(data), "user_concurrency: 5") {
+		t.Fatalf("config missing default user concurrency, got:\n%s", string(data))
+	}
+}