Function main 

pub(crate) fn main()

Main application entry point.

Initializes the server by:

1. Loading environment variables from .env file
2. Establishing database connection pool to PostgreSQL
3. Configuring CORS policy for cross-origin requests
4. Creating the router with create_router containing all endpoints
5. Starting HTTP server on port 8001

Server Configuration

• Binds to 0.0.0.0:8001 (all network interfaces)
• Allows: GET, POST, PATCH, DELETE methods
• Allows credentials and custom headers
• CORS origin configured from Env

State Setup

Creates shared AppState wrapped in Arc and passes to all routes

Panics

• If environment loading fails
• If database connection fails