Add hashpw utility for generating password hashes

Simple CLI utility to generate bcrypt password hashes for admin users.

Usage: hashpw <password>

This utility helps administrators generate properly hashed passwords
for use in configuration files or manual user setup.

cmd/hashpw/main.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/rcourtman/pulse-go-rewrite/internal/auth"
+)
+
+func main() {
+	if len(os.Args) < 2 {
+		fmt.Println("Usage: hashpw <password>")
+		os.Exit(1)
+	}
+
+	password := os.Args[1]
+	hash, err := auth.HashPassword(password)
+	if err != nil {
+		fmt.Printf("Error: %v\n", err)
+		os.Exit(1)
+	}
+
+	fmt.Println(hash)
+}