feat(缓存处理): 添加缩略图生成功能并重构缓存服务逻辑

- 在package.json中添加webpack相关依赖并更新sharp版本
- 新增webpack配置用于代码混淆和打包优化
- 实现缩略图生成功能，当API返回thumb参数时自动创建缩略图
- 重构缓存服务逻辑，优化响应头处理和错误处理
- 移除不必要的path模块引入并统一代码风格

package.json

@@ -1,12 +1,15 @@
 {
-	"dependencies": {
-		"sharp": "^0.33.4"
-	},
-	"devDependencies": {
-		"javascript-obfuscator": "^4.1.1"
-	},
-	"packageManager": "pnpm@9.15.1+sha512.1acb565e6193efbebda772702950469150cf12bcc764262e7587e71d19dc98a423dff9536e57ea44c49bdf790ff694e83c27be5faa23d67e0c033b583be4bfcf",
-	"scripts": {
-		"start": "node source.js"
-	}
+  "dependencies": {
+    "javascript-obfuscator": "^4.1.1",
+    "sharp": "^0.34.2"
+  },
+  "devDependencies": {
+    "webpack": "^5.99.9",
+    "webpack-cli": "^4.10.0",
+    "webpack-obfuscator": "^3.5.1"
+  },
+  "scripts": {
+    "build": "webpack",
+    "start": "node index.js"
+  }
 }