Complete documentation and integration test suite

[quinnjr]

Description

Write comprehensive documentation, examples, and integration tests.

Tasks

Documentation

• Complete API documentation for all public modules
• Write getting started guide
• Create migration guide from other ORMs (Diesel, SeaORM)
• Add advanced usage examples
• Document performance tuning
• Add troubleshooting guide

Examples

• Basic CRUD example project
• REST API with Axum example
• GraphQL API with async-graphql example
• Multi-database example
• Real-world application example

Integration Tests

• PostgreSQL integration tests
• MySQL integration tests
• SQLite integration tests
• Transaction tests
• Migration tests
• Concurrent access tests
• Performance benchmarks

Priority

High - Critical for production readiness