fix: 修正生产环境配置

- Dockerfile: JRE 17 → 21 匹配实际构建环境
- application-prod.yml: 修正 cool 缩进错误，修复 file.base-url 为相对路径

src/main/resources/application-prod.yml

@@ -2,7 +2,7 @@ spring:
   datasource:
     url: jdbc:mysql://mysql:3306/cool?useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2b8
     username: root
-    password: mysql
+    password: "mysql"
     driver-class-name: com.mysql.cj.jdbc.Driver
 
   cache:
@@ -21,7 +21,6 @@ auto-table:
   superInsertPosition: before
   model-package: com.cool.**.entity
 
-# Cool相关配置
 cool:
   captcha:
     enable: false
@@ -29,7 +28,7 @@ cool:
   file:
     mode: local
     local:
-      base-url: http://127.0.0.1:${server.port}/upload
+      base-url: /upload
 
 # 文档
 springdoc: