重构享元模式示例，统一服装接口类型，增强代码一致性和可读性

ts/src/flyweight/index.ts

@@ -3,8 +3,13 @@
 汤宝宝开了一家服装租赁店，好多客人来店里租衣服~
 */
 
+// 享元抽象类 - 服装接口
+interface ClothingInterface {
+  show(): void;
+}
+
 // 享元对象 - 服装
-class Clothing {
+class Clothing implements ClothingInterface {
   private style: string;
   private size: string;
   private color: string;
@@ -24,13 +29,13 @@ class Clothing {
 
 // 享元工厂 - 服装店
 class ClothingFactory {
-  private clothingPool: { [key: string]: Clothing };
+  private clothingPool: { [key: string]: ClothingInterface };
 
   constructor() {
     this.clothingPool = {};
   }
 
-  getClothing(style: string, size: string, color: string): Clothing {
+  getClothing(style: string, size: string, color: string): ClothingInterface {
     const key = `${style}-${size}-${color}`;
     if (!this.clothingPool[key]) {
       this.clothingPool[key] = new Clothing(style, size, color);
@@ -50,14 +55,14 @@ class ClothingFactory {
 // 客人
 class Customer {
   private name: string;
-  clothing: Clothing[];
+  clothing: ClothingInterface[];
 
   constructor(name: string) {
     this.name = name;
     this.clothing = [];
   }
 
-  rentClothing(clothing: Clothing) {
+  rentClothing(clothing: ClothingInterface) {
     console.log(`${this.name} 租了一件服装.`);
     this.clothing.push(clothing);
     clothing.show();