feat: adjust readme and add new seeder script

imphnen-backend/src/bin/seeder.rs

@@ -0,0 +1,25 @@
+use std::error::Error;
+use std::process::Command;
+
+fn run_seed(bin: &str) -> Result<(), Box<dyn Error>> {
+	println!("🔧 Seeding: {bin}");
+	let status = Command::new("cargo").args(["run", "--bin", bin]).status()?;
+
+	if !status.success() {
+		Err(format!("❌ Failed to run seed: {bin}").into())
+	} else {
+		Ok(())
+	}
+}
+
+fn main() -> Result<(), Box<dyn Error>> {
+	println!("🚀 Running all seeders...\n");
+
+	run_seed("seed_permissions")?;
+	run_seed("seed_roles")?;
+	run_seed("seed_roles_permissions")?;
+	run_seed("seed_users")?;
+
+	println!("\n✅ All seeding completed successfully.");
+	Ok(())
+}