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```python
# AI Dev Tool: FastAPI Tailscale Secure Tunnel Simulator
# Description: A production-ready FastAPI micro-SaaS boilerplate with Tailscale secure tunnel integration and Pydantic v2 validation

from fastapi import FastAPI, Depends, HTTPException
from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
from pydantic import BaseModel, validator
from typing import Optional
import requests
import json

# Initialize FastAPI app
app = FastAPI()

# Define security scheme for authentication
security = HTTPBearer()

# Define Pydantic model for Tailscale tunnel configuration
class TailscaleTunnelConfig(BaseModel):
    """Tailscale tunnel configuration model"""
    auth_key: str
    tunnel_name: str
    tunnel_description: Optional[str] = None

@validator('auth_key')
    def validate_auth_key(cls, v):
        """Validate auth key length"""
        if len(v) < 32:
            raise ValueError('Auth key must be at least 32 characters long')
        return v

# Define Pydantic model for retirement simulator input
class RetirementSimulatorInput(BaseModel):
    """Retirement simulator input model"""
    country: str
    age: int
    savings

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