feat: add customizable search relays setting

Replace hardcoded SEARCHABLE_RELAY_URLS with user-configurable search
relays stored in localStorage. Add SearchRelaysSetting UI in System
settings page with add/remove/reset functionality.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/pages/secondary/NoteListPage/index.tsx

@@ -1,11 +1,10 @@
 import { Favicon } from '@/components/Favicon'
 import NormalFeed from '@/components/NormalFeed'
 import { Button } from '@/components/ui/button'
-import { SEARCHABLE_RELAY_URLS } from '@/constants'
 import SecondaryPageLayout from '@/layouts/SecondaryPageLayout'
 import { toProfileList } from '@/lib/link'
 import { fetchPubkeysFromDomain, getWellKnownNip05Url } from '@/lib/nip05'
-import { getDefaultRelayUrls } from '@/lib/relay'
+import { getDefaultRelayUrls, getSearchRelayUrls } from '@/lib/relay'
 import { useSecondaryPage } from '@/PageManager'
 import { useNostr } from '@/providers/NostrProvider'
 import client from '@/services/client.service'
@@ -60,7 +59,7 @@ const NoteListPage = forwardRef(({ index }: { index?: number }, ref) => {
         setSubRequests([
           {
             filter: { search, ...(kinds.length > 0 ? { kinds } : {}) },
-            urls: SEARCHABLE_RELAY_URLS
+            urls: getSearchRelayUrls()
           }
         ])
         return

src/pages/secondary/SystemSettingsPage/index.tsx

@@ -1,4 +1,5 @@
 import DefaultRelaysSetting from '@/components/DefaultRelaysSetting'
+import SearchRelaysSetting from '@/components/SearchRelaysSetting'
 import { Input } from '@/components/ui/input'
 import { Label } from '@/components/ui/label'
 import { Switch } from '@/components/ui/switch'
@@ -47,6 +48,9 @@ const SystemSettingsPage = forwardRef(({ index }: { index?: number }, ref) => {
         <div className="space-y-2 px-4">
           <DefaultRelaysSetting />
         </div>
+        <div className="space-y-2 px-4">
+          <SearchRelaysSetting />
+        </div>
       </div>
     </SecondaryPageLayout>
   )