modify scripts

Makefile

@@ -25,8 +25,8 @@ run: build
 
 # 清理编译生成的二进制文件
 clean:
-	rm -rf $(BIN_DIR)
-	@echo "🗑 Cleaned up $(BIN_DIR)"
+	rm -rf $(BIN_DIR)/$(PROJECT_NAME)
+	@echo "🗑 Cleaned up $(BIN_DIR)/$(PROJECT_NAME)"
 
 # 格式化 Go 代码
 fmt:
@@ -43,6 +43,6 @@ help:
 	@echo "  all      - 编译 (默认目标)"
 	@echo "  build    - 编译 Go 代码"
 	@echo "  run      - 运行编译后的程序"
-	@echo "  clean    - 删除 bin 目录"
+	@echo "  clean    - 删除 bin 目录下生成的可执行文件"
 	@echo "  fmt      - 格式化 Go 代码"
 	@echo "  tidy     - 整理 go.mod 依赖"