[Docs] Documentation Expansion for php-wasm/node

[fellyph]

Summary

Transforms the minimal php-wasm/node documentation into a comprehensive developer guide with practical examples, integration patterns, and real-world use cases.

Motivation

The existing documentation provided only a basic usage example and API reference link, leaving developers without:

• Clear understanding of when and why to use @php-wasm/node
• Practical, copy-paste ready code examples
• Guidance on integrating with existing Node.js tooling
• Best practices for performance and error handling

This created friction for developers trying to adopt WordPress Playground in Node.js environments.

Changes

📚 Documentation Structure

• Added front matter (title, slug) for documentation site integration
• Organized content into logical sections with clear hierarchy
• Included 15+ working code examples across multiple scenarios

🎯 New Sections

Use Cases (8 categories)

Defines clear scenarios where @php-wasm/node provides value:

• Server-Side PHP Execution (CI/CD, testing, microservices)
• Data Processing & Transformation (CSV, JSON, SQLite, ZIP)
• Template Rendering & Content Generation
• API Development & Testing
• PHP Code Analysis & Testing
• Legacy Code Integration
• Educational Platforms
• WordPress Development Tools

Practical Demos (6 complete examples)

Working code demonstrations of common patterns:

1. File System Operations - Directory creation, file I/O, JSON handling
2. SQLite Database Operations - Schema creation, CRUD operations, queries
3. Processing ZIP Archives - Archive creation, inspection, extraction
4. HTTP Request/Response Pattern - Simulating web server behavior
5. Template Rendering Engine - Dynamic HTML generation from templates
6. Real-time Code Execution & Streaming - Streaming output handling

🔧 Technical Details

• All examples use ES modules syntax
• TypeScript examples included for type-safe implementations
• Code follows consistent formatting and style
• Examples are self-contained and immediately runnable

Impact

For Developers:

• Provides ready-to-use patterns for common scenarios
• Demonstrates integration with popular Node.js tools