chore: add eatery inventory item

eatery-service/src/main/java/com/drinkool/entities/EateryInventoryItemEntity.java

@@ -0,0 +1,46 @@
+package com.drinkool.entities;
+
+import jakarta.persistence.*;
+import jakarta.transaction.Transactional;
+
+@Entity
+@Table
+public class EateryInventoryItemEntity extends BaseEntity {
+
+	public int quantity;
+
+	@ManyToOne(fetch = FetchType.LAZY)
+	@JoinColumn(name = "inventory_item_id")
+	public InventoryItemEntity inventoryItem;
+
+	// Create
+	@Transactional
+	public void add(String name, int quantity, String unit) {
+		String itemName = name.toLowerCase();
+
+		InventoryItemEntity item = InventoryItemEntity.find(
+			"name",
+			itemName
+		).firstResult();
+
+		// 2. Nếu chưa có thì mới tạo mới
+		if (item == null) {
+			item = new InventoryItemEntity();
+			if (unit != null) {
+				item.add(itemName, unit);
+			} else {
+				item.add(itemName);
+			}
+		}
+
+		this.inventoryItem = item;
+		this.quantity = quantity;
+
+		this.persist();
+	}
+
+	@Transactional
+	public void add(String name, int quantity) {
+		this.add(name, quantity, null);
+	}
+}

eatery-service/src/main/java/com/drinkool/entities/InventoryItemEntity.java

@@ -9,21 +9,19 @@ import jakarta.transaction.Transactional;
 public class InventoryItemEntity extends BaseEntity {
 
 	public String name;
-	public int quantity;
 	public String unit;
 
 	// Create
 	@Transactional
-	public void add(String name, int quantity, String unit) {
+	public void add(String name, String unit) {
 		this.name = name;
-		this.quantity = quantity;
 		this.unit = unit;
 
 		this.persist();
 	}
 
 	@Transactional
-	public void add(String name, int quantity) {
-		add(name, quantity, "unit");
+	public void add(String name) {
+		add(name, "unit");
 	}
 }

eatery-service/src/main/java/com/drinkool/entities/MenuItemEntity.java

@@ -0,0 +1,11 @@
+package com.drinkool.entities;
+
+import jakarta.persistence.*;
+
+@Entity
+@Table
+public class MenuItemEntity extends BaseEntity {
+    public String name;
+    public double price;
+    
+}