feat(Clash): Add routing rules and enable routing option for Clash subscriptions (#4904)

* feat(clash): add routing rules and enable routing option for Clash/Mihomo subscriptions

Allows adding custom YAML blocks and placeholders to Clash exports.

Why: Shifting routing to the client prevents server IP exposure for
DIRECT traffic and reduces unnecessary server bandwidth/CPU usage.

* fix

---------

Co-authored-by: Misfit-s <>

web/translation/zh-CN.json

@@ -1004,6 +1004,10 @@
       "subEnableRoutingDesc": "在 VPN 客户端中启用路由的全局设置。（僅限 Happ）",
       "subRoutingRules": "路由規則",
       "subRoutingRulesDesc": "VPN 用戶端的全域路由規則。（僅限 Happ）",
+      "subClashEnableRouting": "启用路由",
+      "subClashEnableRoutingDesc": "在生成的 YAML 订阅中包含 Clash/Mihomo 全局路由规则。",
+      "subClashRoutingRules": "全局路由规则",
+      "subClashRoutingRulesDesc": "添加到每个 YAML 订阅开头、MATCH,PROXY 之前的 Clash/Mihomo 规则。",
       "subListen": "监听 IP",
       "subListenDesc": "订阅服务监听的 IP 地址（留空表示监听所有 IP）",
       "subPort": "监听端口",