删除规则组的引用拦截连附加规则一起查

之前只扫顶层 rules。附加规则（sub-rules）里的 RULE-SET 引用漏过的话，
删除会被内核重载拒掉——保护链路能回滚，但用户看到的是解析错误原文
而不是「谁在引用它」。

web/views/RulesPage.vue

@@ -23,6 +23,7 @@ import {
   rulesOf,
   setRuleProviders,
   setRules,
+  subRuleSetReferences,
 } from '@shared/rules.ts'
 import type { IniImportPlan, RuleIssue } from '@shared/rules.ts'
 import type { ConfigObject } from '../../vendor/config-editor/index.ts'
@@ -290,9 +291,14 @@ function onBlockedBackdrop(event: MouseEvent) {
 }
 
 function askRemoveProvider(name: string) {
-  const refs = ruleSetReferences(rules.value, name)
+  // 附加规则（sub-rules）里的引用也要查：漏了的话删除会被内核重载拒掉，
+  // 用户看到的是解析错误原文而不是「谁在引用它」
+  const refs = [
+    ...ruleSetReferences(rules.value, name).map((i) => rules.value[i]!),
+    ...subRuleSetReferences(props.data, name),
+  ]
   if (refs.length > 0) {
-    blockedProvider.value = { name, refs: refs.map((i) => rules.value[i]!) }
+    blockedProvider.value = { name, refs }
   } else {
     removingProvider.value = name
   }