Create a professional README.md with enhanced examples and modern formatting

[Copilot]

Completely redesigned the README.md to transform go-workflows from appearing like a basic project to a professional, enterprise-ready workflow orchestration solution.

Key Improvements

🎨 Visual & Professional Appeal

• Added modern emoji icons and consistent formatting for better visual hierarchy
• Professional badges for build status, Go reference, and Go report card
• Clean section organization with clear typography
• ASCII art architecture diagram showing client/worker/backend relationships

📚 Enhanced Content Structure

Before: Fragmented code snippets with basic explanations
After: Complete, runnable examples with real-world context

• Compelling Introduction: Clear value proposition emphasizing resilience and ease of use
• Feature Highlights: Key benefits with visual icons (Native Go, Automatic Recovery, Multiple Backends, High Performance, Observability, Testing Support, Type Safety)
• Complete Quick Start: Full order processing workflow example instead of disconnected code fragments
• Sample Applications: Well-organized table showcasing all available examples with descriptions
• Backend Comparison: Clear comparison table for SQLite, MySQL, Redis, and in-memory options

🛠️ Technical Enhancements

• Production Patterns: Examples for both simple (WorkflowOrchestrator) and production (separate client/worker) deployments
• Monitoring & Observability: Web UI and OpenTelemetry integration examples
• Testing Framework: Comprehensive testing examples with time manipulation capabilities
• Production Considerations: Guidance on scaling, monitoring, and persistence strategies

🖼️ Interactive Demonstrations

The README now showcases the professional diagnostic web UI:

Workflow Instance List:

Detailed Workflow Execution View:

📦 Better Developer Experience

• Runnable Examples: Clear instructions to try different backends (go run . -backend sqlite)
• Complete Code: Full working examples that developers can copy and run immediately
• Multiple Entry Points: Quick start for beginners, advanced patterns for production users
• Rich Documentation Links: Better organization of existing comprehensive documentation

The new README positions go-workflows as a mature, production-ready solution comparable to enterprise workflow engines like Temporal, while highlighting its Go-native simplicity and embedded nature. All changes maintain backward compatibility and accurately represent the existing functionality.

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