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/pkg/redis/go_redis.go

@@ -33,6 +33,10 @@ func newGoRedis(cfg Config) (Cache, error) {
 	return &goRedisCache{client: client}, nil
 }
 
+func (r *goRedisCache) Capabilities() Capabilities {
+	return Capabilities{SortedSet: true, PubSub: true}
+}
+
 func (r *goRedisCache) Get(ctx context.Context, key string) (string, error) {
 	val, err := r.client.Get(ctx, key).Result()
 	if err == goredis.Nil {

backend/pkg/redis/redis.go

@@ -40,8 +40,15 @@ type SortedSetMember struct {
 	Member string
 }
 
+// Capabilities 缓存后端能力（local/redka 与外部 Redis 差异）// Logan.Li
+type Capabilities struct {
+	SortedSet bool `json:"sorted_set"`
+	PubSub    bool `json:"pubsub"`
+}
+
 // Cache Redis 缓存接口 // Logan.Li
 type Cache interface {
+	Capabilities() Capabilities
 	Get(ctx context.Context, key string) (string, error)
 	Set(ctx context.Context, key string, value string, expiration time.Duration) error
 	Del(ctx context.Context, keys ...string) error

backend/pkg/redis/redka.go

@@ -31,6 +31,10 @@ func newRedka(cfg Config) (Cache, error) {
 	return &redkaCache{db: db}, nil
 }
 
+func (r *redkaCache) Capabilities() Capabilities {
+	return Capabilities{SortedSet: false, PubSub: false}
+}
+
 func (r *redkaCache) Get(ctx context.Context, key string) (string, error) {
 	// Redka v0.2.x: Str().Get() 返回 core.Value // Logan.Li
 	val, err := r.db.Str().Get(key)
@@ -115,5 +119,6 @@ func (r *redkaCache) ZRemRangeByScore(ctx context.Context, key string, min, max
 var errPubSubNotSupported = fmt.Errorf("Pub/Sub is not supported by the redka backend; use go-redis (driver=redis)")
 
 func (r *redkaCache) Publish(ctx context.Context, channel string, message string) error {
-	return errPubSubNotSupported
+	// local/redka 无 Pub/Sub，流水线日志走轮询 Get，此处 no-op // Logan.Li
+	return nil
 }