docs: Add FAQ section

[meichuanyi]

Summary

Add comprehensive FAQ section covering common questions about Magic Enterprise AI Agent Platform.

FAQ Content

• What is Magic? - Enterprise-grade open-source AI Agent platform overview
• Comparison with personal AI assistants - vs OpenClaw, ChatGPT (Enterprise features)
• 7 Enterprise-Grade Capabilities - Knowledge, Deliverables, Security, Human-in-Loop, Cost Control, Team Collaboration, Open Ecosystem
• Personal AI Assistant vs Expert Agents - Two complementary capabilities
• Deployment options - Self-Hosted, Cloud (China/International), Enterprise Edition
• Self-Hosted requirements - Docker + curl, macOS/Linux
• Deliverables - PPTs, Dashboards, Reports, Excel, Infinite Canvases
• Sandbox isolation - Proprietary containers, VPC, tenant isolation
• Human-in-the-Loop - Approval workflow for high-risk operations
• Cost control - Daily budgets per department/user/Agent
• Team collaboration - Multi-user projects, real-time visibility
• Skills ecosystems - Anthropic Skills + OpenClaw Skills compatibility
• Language support - English, 简体中文
• 9 Use Case Scenarios - Real enterprise scenarios
• License - Magic Open Source License (Apache 2.0 + restrictions)
• Help resources - Issues, Discussions, Email

Checklist

• Documentation adds value without redundancy
• FAQ answers common user questions
• Formatting consistent with existing README