Add AI Agent Framework Integration Guide

[HuiNeng6]

Summary

This PR adds a comprehensive AI Agent Framework Integration Guide for WattCoin API.

Changes

• Added \docs/agent-integration-guide.md\

Content Covered

Framework Integrations

1. LangChain - Custom tools, agent creation, and bounty discovery
2. CrewAI - Multi-agent crew setup with specialized agents
3. AutoGPT - Custom commands and autonomous operation
4. OpenAI Assistants API - Function calling and streaming responses

API Endpoints Documented

• \GET /api/v1/bounties\ - List open bounties
• \GET /api/v1/tasks\ - List available tasks
• \GET /api/v1/stats\ - Network statistics
• \GET /api/v1/balance/{wallet}\ - Check WATT balance

Additional Features

• Authentication patterns (API Key + future wallet-signed)
• Programmatic bounty discovery and claiming
• Best practices (rate limiting, error handling, caching)
• Working Python code examples for all frameworks

Related Issue

Closes #214

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[WattCoin-Org]

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