refactor: restructure event handling from trait objects to enum pattern

- Convert UnifiedEvent from trait object (Box<dyn UnifiedEvent>) to concrete enum type
  - Remove match_event! macro in favor of native match expressions
  - Simplify event metadata access: event.event_type() -> event.metadata().event_type
  - Unify event callback signatures: Fn(Box<dyn UnifiedEvent>) -> Fn(UnifiedEvent)
  - Update all example code to use the new enum-based event system
  - Optimize type system to reduce runtime overhead and improve type safety

  Affected scope:
  - Core event parser and processor
  - All protocol event definitions (PumpFun, PumpSwap, Bonk, Raydium series, etc.)
  - gRPC and Shred streaming modules
  - All example code

src/streaming/shred/connection.rs

@@ -1,5 +1,4 @@
 use std::sync::Arc;
-use std::sync::RwLock;
 use tokio::sync::Mutex;
 use tonic::transport::Channel;
 
@@ -14,8 +13,6 @@ use crate::streaming::common::{
 pub struct ShredStreamGrpc {
     pub shredstream_client: Arc<ShredstreamProxyClient<Channel>>,
     pub config: StreamClientConfig,
-    pub metrics: Arc<RwLock<PerformanceMetrics>>,
-    pub metrics_manager: MetricsManager,
     pub subscription_handle: Arc<Mutex<Option<SubscriptionHandle>>>,
 }
 
@@ -28,38 +25,14 @@ impl ShredStreamGrpc {
     /// 创建客户端，使用自定义配置
     pub async fn new_with_config(endpoint: String, config: StreamClientConfig) -> AnyResult<Self> {
         let shredstream_client = ShredstreamProxyClient::connect(endpoint.clone()).await?;
-        let metrics = Arc::new(RwLock::new(PerformanceMetrics::new()));
-
-        let metrics_manager = MetricsManager::new(config.enable_metrics, "ShredStream".to_string());
-
+        MetricsManager::init(config.enable_metrics);
         Ok(Self {
             shredstream_client: Arc::new(shredstream_client),
             config,
-            metrics: metrics.clone(),
-            metrics_manager,
             subscription_handle: Arc::new(Mutex::new(None)),
         })
     }
 
-    /// Creates a new ShredStreamClient with high-throughput configuration.
-    ///
-    /// This is a convenience method that creates a client optimized for high-concurrency scenarios
-    /// where throughput is prioritized over latency. See `StreamClientConfig::high_throughput()`
-    /// for detailed configuration information.
-    pub async fn new_high_throughput(endpoint: String) -> AnyResult<Self> {
-        Self::new_with_config(endpoint, StreamClientConfig::high_throughput()).await
-    }
-
-    /// Creates a new ShredStreamClient with low-latency configuration.
-    ///
-    /// This is a convenience method that creates a client optimized for real-time scenarios
-    /// where latency is prioritized over throughput. See `StreamClientConfig::low_latency()`
-    /// for detailed configuration information.
-    pub async fn new_low_latency(endpoint: String) -> AnyResult<Self> {
-        Self::new_with_config(endpoint, StreamClientConfig::low_latency()).await
-    }
-
-
     /// 获取当前配置
     pub fn get_config(&self) -> &StreamClientConfig {
         &self.config
@@ -72,7 +45,7 @@ impl ShredStreamGrpc {
 
     /// 获取性能指标
     pub fn get_metrics(&self) -> PerformanceMetrics {
-        self.metrics_manager.get_metrics()
+        MetricsManager::global().get_metrics()
     }
 
     /// 启用或禁用性能监控
@@ -82,12 +55,12 @@ impl ShredStreamGrpc {
 
     /// 打印性能指标
     pub fn print_metrics(&self) {
-        self.metrics_manager.print_metrics();
+        MetricsManager::global().print_metrics();
     }
 
     /// 启动自动性能监控任务
     pub async fn start_auto_metrics_monitoring(&self) {
-        self.metrics_manager.start_auto_monitoring().await;
+        MetricsManager::global().start_auto_monitoring().await;
     }
 
     /// 停止当前订阅

src/streaming/shred/mod.rs

@@ -10,6 +10,5 @@ pub use types::*;
 
 // 从公用模块重新导出
 pub use crate::streaming::common::{
-    BackpressureConfig, BackpressureStrategy, ConnectionConfig, MetricsEventType, MetricsManager,
-    PerformanceMetrics, StreamClientConfig,
+    ConnectionConfig, MetricsEventType, MetricsManager, PerformanceMetrics, StreamClientConfig,
 };