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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Boilerplate
# ======================================================

"""
Production-ready FastAPI Pydantic v2 Micro-SaaS boilerplate.
Includes user authentication, authorization, and example routes.
"""

# Import dependencies
from fastapi import FastAPI, Depends, HTTPException
from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
from pydantic import BaseModel, Field
from pydantic.validators import EmailStr
from passlib.context import CryptContext
from jose import jwt, JWTError
from datetime import datetime, timedelta
from typing import Optional

# Define constants
SECRET_KEY = "your_secret_key_here"
ALGORITHM = "HS256"
ACCESS_TOKEN_EXPIRE_MINUTES = 30

# Define the user model
class User(BaseModel):
    """User model"""
    id: int
    username: str
    email: EmailStr
    full_name: Optional[str] = None
    disabled: Optional[bool] = None

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

# Define the token model
class Token(BaseModel):
    """Token model

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