Add enhanced concurrency patterns, rate limiting, market management, and pipeline processing

@prompts/concurrency-patterns.md

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+You are an expert in Go concurrency patterns and high-performance systems. I'm building an MEV bot that needs to efficiently process thousands of transactions per second using advanced concurrency patterns.
+
+I need help with:
+
+1. Implementing efficient worker pools for transaction processing
+2. Creating pipeline patterns for multi-stage processing
+3. Implementing fan-in and fan-out patterns for data distribution
+4. Using channels effectively for communication between goroutines
+5. Managing rate limiting across multiple RPC endpoints
+6. Implementing backpressure handling to prevent resource exhaustion
+7. Optimizing memory usage and garbage collection
+8. Using context for cancellation and timeouts
+
+Please provide production-ready Go code that:
+- Implements efficient concurrency patterns
+- Handles errors gracefully without leaking goroutines
+- Uses appropriate buffering for channels
+- Follows Go best practices for concurrent programming
+- Includes comprehensive comments explaining the patterns used
+- Provides metrics for monitoring performance
+
+The code should:
+- Process transactions with minimal latency
+- Scale efficiently across multiple CPU cores
+- Handle backpressure gracefully
+- Provide clear error handling and recovery
+- Include benchmarks for critical functions