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/schemas/setting.ts

@@ -59,6 +59,8 @@ export const AllSettingSchema = z.object({
   subURI: z.string().optional(),
   subJsonURI: z.string().optional(),
   subClashURI: z.string().optional(),
+  subClashEnableRouting: z.boolean().optional(),
+  subClashRules: z.string().optional(),
   subJsonFragment: z.string().optional(),
   subJsonNoises: z.string().optional(),
   subJsonMux: z.string().optional(),