优化 local 模式兼容性与部署可靠性

- SQL 方言层：agent updated_at、dashboard 小时分桶、清理任务跨 SQLite/MySQL
- Cache Capabilities：redka 跳过 ZSet/PubSub，Agent 聚合改 DB 直读
- local 模式 redka 初始化失败 Fatal；/version 返回 features
- SQLite WAL + 连接池限制；K8s data 改 PVC 持久化
- run.sh：旧参数迁移、升级后 /version 校验

backend/main.go

@@ -139,10 +139,21 @@ func main() {
 		DataDir:  "data/redka",
 	})
 	if err != nil {
+		if cfg.Mode == "local" {
+			log.Fatal("local 模式缓存(redka)初始化失败", zap.Error(err))
+		}
 		log.Warn("缓存初始化失败，继续启动", zap.Error(err))
 		cache = nil
 	} else {
-		log.Info("缓存已就绪", zap.String("driver", cfg.Redis.Driver))
+		caps := cache.Capabilities()
+		log.Info("缓存已就绪",
+			zap.String("driver", cfg.Redis.Driver),
+			zap.Bool("sorted_set", caps.SortedSet),
+			zap.Bool("pubsub", caps.PubSub),
+		)
+		if cfg.Mode == "local" && (!caps.SortedSet || !caps.PubSub) {
+			log.Info("local 模式：Agent 热指标走 DB 直读，流水线日志走轮询")
+		}
 		defer cache.Close()
 	}
 
@@ -156,14 +167,18 @@ func main() {
 
 	// 版本信息 API
 	r.GET("/version", func(c *gin.Context) {
-		c.JSON(http.StatusOK, gin.H{
+		resp := gin.H{
 			"version":      Version,
 			"build_time":   BuildTime,
 			"git_commit":   GitCommit,
 			"mode":         cfg.Mode,
 			"db_driver":    cfg.Database.Driver,
 			"redis_driver": cfg.Redis.Driver,
-		})
+		}
+		if cache != nil {
+			resp["features"] = cache.Capabilities()
+		}
+		c.JSON(http.StatusOK, resp)
 	})
 
 	// 注册路由
@@ -173,13 +188,9 @@ func main() {
 	go func() {
 		ticker := time.NewTicker(24 * time.Hour)
 		defer ticker.Stop()
+		cleanupSQL := database.CleanupAgentReportsSQL(cfg.Database.Driver)
 		for range ticker.C {
-			var rows int64
-			if cfg.Database.Driver == "sqlite" {
-				rows = db.Exec("DELETE FROM monitor_agent_reports WHERE report_time < datetime('now', '-7 days')").RowsAffected
-			} else {
-				rows = db.Exec("DELETE FROM monitor_agent_reports WHERE report_time < DATE_SUB(NOW(), INTERVAL 7 DAY)").RowsAffected
-			}
+			rows := db.Exec(cleanupSQL).RowsAffected
 			if rows > 0 {
 				log.Info("清理过期的 agent 上报数据", zap.Int64("rows", rows))
 			}