Initial commit: Set up MEV bot project structure

@prompts/error-handling.md

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+You are an expert in Go error handling and logging best practices. I'm building an MEV bot in Go that needs robust error handling and comprehensive logging for production deployment.
+
+I need help with:
+
+1. Implementing structured logging throughout the application
+2. Creating meaningful error messages for debugging
+3. Implementing retry mechanisms for transient failures
+4. Handling fatal errors gracefully
+5. Implementing circuit breakers for external services
+6. Creating health checks and metrics
+
+Please provide production-ready Go code that:
+- Uses a structured logging library (like zap or logrus)
+- Implements comprehensive error wrapping and context
+- Includes retry mechanisms with exponential backoff
+- Handles fatal errors gracefully with proper cleanup
+- Follows Go best practices for error handling
+- Is optimized for performance
+- Includes comprehensive comments
+
+The code should:
+- Log at appropriate levels (debug, info, warn, error)
+- Include contextual information in log messages
+- Implement circuit breakers for RPC connections
+- Handle timeouts appropriately
+- Provide health check endpoints
+- Export metrics for monitoring