feat: 支持配置渠道被禁用后是否清空渠道粘性 (#5306)

* fix: evict stale channel affinity

* feat: configure disabled channel affinity retention

---------

Co-authored-by: Seefs <i@seefs.me>

web/default/src/i18n/locales/zh.json

@@ -644,6 +644,7 @@
     "Channel Affinity": "渠道亲和性",
     "Channel affinity reuses the last successful channel based on keys extracted from the request context or JSON body.": "渠道亲和性会基于从请求上下文或 JSON Body 提取的 Key，优先复用上一次成功的渠道。",
     "Channel Affinity: Upstream Cache Hit": "渠道亲和性：上游缓存命中",
+    "Keep affinity when channel is disabled": "渠道禁用后保留亲和",
     "Channel copied successfully": "渠道复制成功",
     "Channel created successfully": "渠道创建成功",
     "Channel deleted successfully": "渠道删除成功",
@@ -1994,6 +1995,7 @@
     "If connecting to upstream One API or New API relay projects, use OpenAI type instead unless you know what you are doing": "如果连接上游 One API 或 New API 中继项目，除非您知道自己在做什么，否则请使用 OpenAI 类型",
     "If default auto group is enabled, newly created tokens start with auto instead of an empty group.": "如果启用默认 auto 分组，新建令牌会默认使用 auto，而不是空分组。",
     "If the affinity channel fails and retry succeeds on another channel, update affinity to the successful channel.": "如果亲和到的渠道失败，重试到其他渠道成功后，将亲和更新到成功的渠道。",
+    "When enabled, keep the affinity entry even if the affinity channel is disabled or no longer usable for the current group/model. Leave it off to delete the entry and select another channel.": "开启后，亲和到的渠道被禁用，或不再适用于当前分组/模型时，仍保留这条亲和；关闭时会删除并重新选择渠道。",
     "If this keeps happening, please report it on GitHub Issues.": "如果问题持续出现，请到 GitHub Issues 反馈。",
     "If you provide generative AI services to the public in mainland China, you will fulfill legal obligations including filing, security assessment, content safety, complaint handling, generated content labeling, log retention, and personal information protection.": "如果你在中国大陆向公众提供生成式人工智能服务，你将履行备案、安全评估、内容安全、投诉处理、生成内容标识、日志留存和个人信息保护等法律义务。",
     "Ignored upstream models": "已忽略上游模型",