feat(routing): add panel-only comment field to routing rules (#6361)

Can annotate rules with a human-readable note for easier management.
The comment is stripped before sending the config to xray-core (same
pattern as the existing 'enabled' flag).

Backend: stripDisabledRules now removes 'comment' from generated config.
Frontend: input field in RuleFormModal, column in desktop table, chip
with tooltip in mobile card list. Schema and type definitions updated.

frontend/src/schemas/routing.ts

@@ -15,6 +15,7 @@ export type RuleWebhook = z.infer<typeof RuleWebhookSchema>;
 export const RuleObjectSchema = z.object({
   type: z.literal('field').default('field'),
   enabled: z.boolean().optional(),
+  comment: z.string().optional(),
   domain: z.array(z.string()).optional(),
   ip: z.array(z.string()).optional(),
   port: PortValueSchema.optional(),