fix: application-prod.yml 增加 Redis database + MinIO bucket 配置

- Redis: 新增 database 参数支持多项目隔离 (DB 0=公共, DB 1=tianai-captcha)
- MinIO: bucket 默认值改为 tianai-captcha
- 所有参数通过环境变量注入，兼容不同环境

tianai-captcha-platform/src/main/resources/application-prod.yml

@@ -23,6 +23,7 @@ spring:
       host: ${REDIS_HOST:localhost}
       port: ${REDIS_PORT:6379}
       password: ${REDIS_PASS:}
+      database: ${REDIS_DB:0}
 
   jackson:
     date-format: yyyy-MM-dd HH:mm:ss
@@ -44,7 +45,7 @@ minio:
   endpoint: ${MINIO_ENDPOINT:http://localhost:9000}
   access-key: ${MINIO_ACCESS_KEY:minioadmin}
   secret-key: ${MINIO_SECRET_KEY:minioadmin}
-  bucket: ${MINIO_BUCKET:captcha-resources}
+  bucket: ${MINIO_BUCKET:tianai-captcha}
 
 logging:
   level: