feat: refactor to multi-protocol event streaming system

Major architectural refactor, upgrading from simple logging system to comprehensive multi-protocol Solana DEX event streaming system:

✨ New Features:
- Support for 5 DEX protocols: PumpFun, PumpSwap, Bonk, Raydium CPMM, Raydium CLMM
- Implement unified event interface (UnifiedEvent trait) and event factory pattern
- Add dual streaming support: Yellowstone gRPC and ShredStream
- Add Chinese documentation (README_CN.md)

🏗️ Architectural Improvements:
- Refactor event parsing system with modular design
- Implement protocol-specific parsers and event types
- Optimize dependency management, update Cargo.toml
- Remove legacy logging modules, clean up redundant code

📊 Statistics:
- Added 46 files, 4511 lines of code
- Removed 1381 lines of legacy code
- Net addition of 3130 lines of code

Tech Stack:
- Rust async/await for asynchronous processing
- Protocol Buffers support
- Multi-protocol event parsing
- High-performance event stream subscription

src/lib.rs

@@ -1,3 +1,3 @@
-pub mod common;
-pub mod grpc;
-pub mod error;
+pub mod streaming;
+pub mod protos;
+pub mod common;