docs: Add comprehensive troubleshooting and system requirements documentation

[sohw400]

Summary

This PR adds comprehensive documentation improvements to enhance user experience and reduce common setup issues:

• Troubleshooting section (231 lines): Covers Docker issues, node sync problems, configuration errors, validator issues, network connectivity, and performance optimization
• System requirements section (148 lines): Provides detailed hardware/software specifications for development, production, and enterprise deployments

Problem Solved

Addresses common user issues identified from GitHub issues:

• Docker compose startup errors (docker-compose up -d error #729)
• Configuration panic with unknown fields (Panic: unknown field "max_retries_to_fulfil_nonces_reputer" in types.Params On Starting Chain #674)
• Script execution failures (Error exec /scripts/l1_node.sh: no such file or directory when run full node. #383)
• Lack of system requirement guidance before installation

Changes Made

📋 Troubleshooting Section

• Docker Issues: compose errors, script execution, resource failures
• Node Synchronization: slow sync, state sync failures, connection issues
• Configuration Problems: genesis validation, key management, panic errors
• Validator Issues: registration problems, slashing, voting power
• Network Connectivity: peer connections, RPC accessibility
• Performance Optimization: memory usage, disk space management
• Help Resources: log checking, issue reporting guidelines

🖥️ System Requirements Section

• Tiered Hardware Specs: Development (2 cores, 4GB) → Production (4+ cores, 8GB) → Enterprise (8+ cores, 32GB+)
• Storage Guidance: Growth estimates, performance requirements, pruning strategies
• Network Requirements: Bandwidth, latency, port configurations
• OS Support: Linux (recommended), macOS (dev), Windows WSL2 (dev)
• Security Considerations: Firewall setup, key management, HSM recommendations
• Cloud Provider Recommendations: AWS, GCP, Azure instance specifications

Test Plan

• Verified README structure integrity
• Checked internal link references
• Validated markdown formatting
• Ensured no breaking changes to existing content
• Confirmed proper section ordering

Impact

• Improved Onboarding: New users can plan systems before installation
• Reduced Support Burden: Self-service troubleshooting for common issues
• Better Production Deployments: Clear enterprise-grade specifications
• Enhanced User Experience: Comprehensive guidance from planning to troubleshooting