Add comprehensive CLAUDE.md guide for Claude Code users

[Copilot]

This PR adds a comprehensive CLAUDE.md documentation specifically designed for Claude Code users who want to integrate Anthropic's Claude models with the Agentica framework.

What's Included

The new documentation provides:

• Quick Start Guide: Installation and basic configuration examples for Claude integration
• Model Comparison Table: Complete overview of all current Claude models (3.5 Sonnet, 3.5 Haiku, Opus, etc.) with use case recommendations
• Configuration Examples: Production, development, and high-concurrency setups optimized for Claude
• Integration Patterns: TypeScript class and OpenAPI integration with Claude-specific optimizations
• MCP Alternative Benefits: Detailed comparison showing how Agentica provides a superior alternative to Anthropic's Model Context Protocol
• Best Practices: Function design patterns, error handling, and performance optimization techniques
• Complete Examples: Code assistant and document processor implementations
• Troubleshooting Section: Common issues and solutions specific to Claude integration

Key Features

The guide emphasizes Claude's advantages within Agentica:

const agent = new Agentica({
  vendor: {
    api: new OpenAI({
      apiKey: process.env.ANTHROPIC_API_KEY,
      baseURL: "https://api.anthropic.com/v1",
    }),
    model: "claude-3-5-sonnet-20241022",
  },
  controllers: [
    // Claude uses standard JSON Schema for better compatibility
    typia.llm.controller<YourFunctions, "claude">(
      "functions",
      new YourFunctions(),
    ),
  ],
});

The documentation highlights that Claude models use standard JSON Schema (unlike some other providers), making them more reliable and compatible with Agentica's validation feedback system.

Documentation Style

The guide follows the project's established documentation patterns with:

• Professional badges and branding
• Comprehensive code examples
• Mermaid diagrams for technical concepts
• Consistent emoji usage and formatting
• Links to existing resources and community

This makes Agentica more accessible to Claude users while positioning it as a cost-effective, TypeScript-native alternative to Anthropic's MCP.

Fixes #482.

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