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 <>

frontend/src/pages/api-docs/endpoints.ts

@@ -1114,7 +1114,7 @@ export const sections: readonly Section[] = [
       {
         method: 'GET',
         path: '/{clashPath}:subid',
-        summary: 'Return subscription as a Clash/Mihomo-compatible YAML config. Only when Clash subscription is enabled in settings. Default path: /clash/:subid.',
+        summary: 'Return subscription as a Clash/Mihomo-compatible YAML config, including configured global Clash routing rules. Only when Clash subscription is enabled in settings. Default path: /clash/:subid.',
         params: [
           { name: 'subid', in: 'path', type: 'string', desc: 'Client subscription ID.' },
         ],

frontend/src/pages/settings/SubscriptionGeneralTab.tsx

@@ -166,6 +166,20 @@ export default function SubscriptionGeneralTab({ allSetting, updateSetting }: Su
               <Input.TextArea value={allSetting.subRoutingRules} placeholder="happ://routing/add/..."
                 onChange={(e) => updateSetting({ subRoutingRules: e.target.value })} />
             </SettingListItem>
+
+            <Divider>Clash / Mihomo</Divider>
+
+            <SettingListItem paddings="small" title={t('pages.settings.subClashEnableRouting')} description={t('pages.settings.subClashEnableRoutingDesc')}>
+              <Switch checked={allSetting.subClashEnableRouting} onChange={(v) => updateSetting({ subClashEnableRouting: v })} />
+            </SettingListItem>
+            <SettingListItem paddings="small" title={t('pages.settings.subClashRoutingRules')} description={t('pages.settings.subClashRoutingRulesDesc')}>
+              <Input.TextArea
+                value={allSetting.subClashRules}
+                rows={8}
+                placeholder={'GEOSITE,category-ir,DIRECT\nGEOIP,private,DIRECT'}
+                onChange={(e) => updateSetting({ subClashRules: e.target.value })}
+              />
+            </SettingListItem>
           </>
         ),
       },