docs: note automatic migrations in README

README.md

@@ -44,23 +44,18 @@ Starts PostgreSQL and the server together:
 docker compose up --build
 ```
 
-The server will be available at `http://localhost:3000`.
+The server will be available at `http://localhost:3000`. Migrations run automatically on startup — no manual step needed.
 
 ### 2b. Run locally
 
 Requires a running PostgreSQL instance matching your `DATABASE_URL`.
 
 ```bash
-# Install sqlx-cli if needed
-cargo install sqlx-cli --no-default-features --features rustls,postgres
-
-# Run migrations
-sqlx migrate run
-
-# Start the server
 cargo run
 ```
 
+Migrations are embedded in the binary and run automatically when the server starts.
+
 ## Environment variables
 
 | Variable | Description | Example |