同步完整源码至远程：扁平化重构现状 + 未入库源文件

- 补入库：server/internal/db/dump.go、redis 分页/扫描预算测试、opsxdb-mcp main_test、
  packages/opsxdb-mcp package-lock、docs 审计与对比文档等 37 个新文件
- 含结构扁平化进行中的 80 处修改与 155 处旧结构删除（server/ src/ src-tauri/ 为当前有效源）
- 构建产物（bin/target/dist）与签名私钥仍按规则排除

server/internal/db/redis_mode_test.go

@@ -1,8 +1,10 @@
 package db
 
 import (
+	"errors"
 	"strings"
 	"testing"
+	"time"
 )
 
 func TestParseRedisAddrs(t *testing.T) {
@@ -26,3 +28,32 @@ func TestOpenRedisModeValidation(t *testing.T) {
 		t.Fatalf("cluster without nodes: %v", err)
 	}
 }
+
+func TestNormalizeRedisModeInfersClusterFromNodes(t *testing.T) {
+	cases := []struct {
+		name string
+		c    ConnReq
+		want string
+	}{
+		{"空配置回单机", ConnReq{}, "standalone"},
+		{"显式 sentinel 保留", ConnReq{RedisMode: "Sentinel", RedisNodes: "127.0.0.1:26379"}, "sentinel"},
+		{"多节点未选模式推断 cluster", ConnReq{RedisNodes: "127.0.0.1:7101,127.0.0.1:7102"}, "cluster"},
+		{"单节点未选模式保持单机", ConnReq{Host: "127.0.0.1", Port: 6379, RedisNodes: "127.0.0.1:6379"}, "standalone"},
+	}
+	for _, tc := range cases {
+		if got := normalizeRedisMode(tc.c); got != tc.want {
+			t.Fatalf("%s: want %s, got %s", tc.name, tc.want, got)
+		}
+	}
+}
+
+func TestRedisErrMovedHint(t *testing.T) {
+	res := redisErr(time.Now(), errors.New("MOVED 12503 127.0.0.1:7103"))
+	if !strings.Contains(res.Error, "部署模式切为 Cluster") {
+		t.Fatalf("MOVED 错误应带模式切换提示: %q", res.Error)
+	}
+	res = redisErr(time.Now(), errors.New("WRONGTYPE Operation against"))
+	if strings.Contains(res.Error, "Cluster") {
+		t.Fatalf("普通错误不应带集群提示: %q", res.Error)
+	}
+}