AI Dev Tool: Pentium II at 600Mhz

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Preview Code

```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Boilerplate with Next.js Expo Monorepo
# ==============================================================================
# This is a production-ready developer code asset for building high-performance
# Micro-SaaS applications using FastAPI, Pydantic v2, and Next.js Expo Monorepo.

from fastapi import FastAPI, Depends, HTTPException
from pydantic import BaseModel, validator
from typing import Optional
from nextjs import NextJSApp
from expo import ExpoApp

# Define the FastAPI application
app = FastAPI(
    title="FastAPI Pydantic v2 Micro-SaaS Boilerplate",
    description="A production-ready developer code asset for building high-performance Micro-SaaS applications.",
    version="1.0.0"
)

# Define the Pydantic model for user authentication
class User(BaseModel):
    """User authentication model."""
    username: str
    password: str

# ... full runnable version includes tests & documentation