feat(service): add auth menu and order service templates

src/main/java/dev/service/AuthService.java

@@ -0,0 +1,23 @@
+package dev.service;
+
+import dev.model.User;
+
+public class AuthService {
+
+    public boolean register(String username, String password, String email) {
+
+        // TODO:
+        // Validate and register user
+
+        return false;
+    }
+
+    public User login(String username, String password) {
+
+        // TODO:
+        // Authenticate user
+
+        return null;
+    }
+
+}

src/main/java/dev/service/MenuService.java

@@ -0,0 +1,12 @@
+package dev.service;
+
+public class MenuService {
+
+    public void showMenu() {
+
+        // TODO:
+        // Display menu items
+
+    }
+
+}

src/main/java/dev/service/OrderService.java

@@ -0,0 +1,26 @@
+package dev.service;
+
+public class OrderService {
+
+    public void placeOrder(int userId) {
+
+        // TODO:
+        // Create order
+
+    }
+
+    public void printReceipt(int orderId) {
+
+        // TODO:
+        // Print order receipt
+
+    }
+
+    public void showOrderHistory(int userId) {
+
+        // TODO:
+        // Display user's order history
+
+    }
+
+}