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)