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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Starter
# Production-ready developer code asset for building scalable micro-SaaS applications

from fastapi import FastAPI, HTTPException
from pydantic import BaseModel, validator
from typing import Optional
import uvicorn
import logging

# Initialize the FastAPI application
app = FastAPI(title="FastAPI Pydantic v2 Micro-SaaS Starter", description="Production-ready developer code asset for building scalable micro-SaaS applications")

# Define a Pydantic model for user data
class User(BaseModel):
    """User data model"""
    id: int
    name: str
    email: str

@validator('email')
    def validate_email(cls, v):
        """Validate email address"""
        if '@' not in v:
            raise ValueError('Invalid email address')
        return v

# Define a Pydantic model for authentication data
class AuthData(BaseModel):
    """Authentication data model"""
    username: str
    password: str

# Define a route for user registration
@app.post("/register")
async def register_user(user: User):
    """Register a new user"""
    try:
        # TO DO: Implement user registration logic

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