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```python
# AI Dev Tool: Next.js Expo Monorepo Boilerplate with PostgreSQL Vector Search Extension
# =====================================================================================
# This is a high-demand production-ready developer code asset.
# It combines the power of Next.js, Expo, and PostgreSQL Vector Search Extension.

import os
import subprocess
from typing import Dict, List

# Define the project structure
PROJECT_STRUCTURE = {
    "apps": ["web", "mobile"],
    "packages": ["ui", "api"],
    "scripts": ["start", "build", "test"]
}

# Define the dependencies
DEPENDENCIES = {
    "next": "^12.2.5",
    "expo": "^45.0.0",
    "postgresql": "^8.7.3",
    "vector-search": "^1.0.0"
}

# Define the PostgreSQL Vector Search Extension configuration
VECTOR_SEARCH_CONFIG = {
    "host": "localhost",
    "port": 5432,
    "database": "mydatabase",
    "user": "myuser",
    "password": "mypassword"
}

def create_project_structure(project_name: str) -> None:
    """
    Create the project structure.
    
    Args:
    project_name (str): The name of the project.

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