feat(backend): 注册限流阈值改为可配置

fruitshorts-app-api/src/main/resources/application-prod.yml

@@ -17,6 +17,9 @@ spring:
     timeout-per-shutdown-phase: 30s
 
 fruitshorts:
+  auth:
+    register-max-per-ip-per-day: 5
+    register-max-per-device-per-day: 3
   media:
     # 生产必须开启播放地址签名（docs/12-上线检查清单）
     signature-required: true