feat(chat): implement sequence pre-allocation, versioned sync, and push worker

Introduce several performance and synchronization enhancements:
- Implement `SeqBufferManager` to allow sequence number pre-allocation via Redis Lua scripts, reducing atomic increment overhead.
- Add `PushWorker` to handle asynchronous message pushing using Redis Streams.
- Implement incremental conversation synchronization via `ConversationVersionLog` to allow clients to fetch only recent changes.
- Add support for Gzip compression in WebSocket communications to reduce bandwidth usage.
- Update dependency injection and configuration to support these new components.

internal/config/config.go

@@ -34,6 +34,9 @@ type Config struct {
 	SetupSecret       string                  `mapstructure:"setup_secret"`
 	WebSocket         WSConfig                `mapstructure:"websocket"`
 	Runner            RunnerConfig            `mapstructure:"runner"`
+	SeqBuffer         SeqBufferConfig         `mapstructure:"seq_buffer"`
+	VersionLog        VersionLogConfig        `mapstructure:"version_log"`
+	PushWorker        PushWorkerConfig        `mapstructure:"push_worker"`
 }
 
 // Load 加载配置文件
@@ -191,6 +194,25 @@ func Load(configPath string) (*Config, error) {
 	viper.SetDefault("runner.cluster.cap_prefix", "runner:cap:")
 	viper.SetDefault("runner.cluster.registry_ttl", 90)
 	viper.SetDefault("runner.cluster.heartbeat_interval", 30)
+	// SeqBuffer 默认值
+	viper.SetDefault("seq_buffer.enabled", false)
+	viper.SetDefault("seq_buffer.private_buffer_size", 50)
+	viper.SetDefault("seq_buffer.group_buffer_size", 200)
+	viper.SetDefault("seq_buffer.lock_timeout_ms", 5000)
+	viper.SetDefault("seq_buffer.max_retries", 3)
+	// VersionLog 默认值
+	viper.SetDefault("version_log.enabled", false)
+	viper.SetDefault("version_log.sync_limit", 100)
+	viper.SetDefault("version_log.max_sync_gap", 1000)
+	// PushWorker 默认值
+	viper.SetDefault("push_worker.enabled", false)
+	viper.SetDefault("push_worker.stream", "msg_push")
+	viper.SetDefault("push_worker.group", "push_worker")
+	viper.SetDefault("push_worker.batch_size", 50)
+	viper.SetDefault("push_worker.poll_timeout_ms", 2000)
+	viper.SetDefault("push_worker.max_retries", 3)
+	viper.SetDefault("push_worker.max_stream_len", 100000)
+	viper.SetDefault("push_worker.idle_timeout_ms", 30000)
 
 	if err := viper.ReadInConfig(); err != nil {
 		return nil, fmt.Errorf("failed to read config: %w", err)

internal/config/push_worker.go

@@ -0,0 +1,13 @@
+package config
+
+// PushWorkerConfig 推送 Worker 配置（Redis Stream 异步推送）
+type PushWorkerConfig struct {
+	Enabled       bool  `mapstructure:"enabled"`
+	Stream        string `mapstructure:"stream"`          // Redis Stream 名称，默认 "msg_push"
+	Group         string `mapstructure:"group"`           // Consumer Group 名称，默认 "push_worker"
+	BatchSize     int   `mapstructure:"batch_size"`      // XREADGROUP 每次读取条数，默认 50
+	PollTimeoutMs int   `mapstructure:"poll_timeout_ms"` // XREADGROUP BLOCK 超时 ms，默认 2000
+	MaxRetries    int   `mapstructure:"max_retries"`     // 消息最大重试次数，默认 3
+	MaxStreamLen  int64 `mapstructure:"max_stream_len"`  // Stream MAXLEN，默认 100000
+	IdleTimeoutMs int64 `mapstructure:"idle_timeout_ms"` // XPENDING 空闲超时 ms，默认 30000
+}

internal/config/seq_buffer.go

@@ -0,0 +1,10 @@
+package config
+
+// SeqBufferConfig seq 预分配配置
+type SeqBufferConfig struct {
+	Enabled           bool `mapstructure:"enabled"`
+	PrivateBufferSize int  `mapstructure:"private_buffer_size"` // 私聊预分配步长（默认 50）
+	GroupBufferSize   int  `mapstructure:"group_buffer_size"`   // 群聊预分配步长（默认 200）
+	LockTimeoutMs     int  `mapstructure:"lock_timeout_ms"`     // 分布式锁超时毫秒（默认 5000）
+	MaxRetries        int  `mapstructure:"max_retries"`         // 冷启动重试次数（默认 3）
+}

internal/config/version_log.go

@@ -0,0 +1,8 @@
+package config
+
+// VersionLogConfig 版本日志增量同步配置
+type VersionLogConfig struct {
+	Enabled     bool `mapstructure:"enabled"`
+	SyncLimit   int  `mapstructure:"sync_limit"`    // 单次同步最大返回条数
+	MaxSyncGap  int64 `mapstructure:"max_sync_gap"` // 超过此版本差距建议全量同步
+}