feat(onboarding): always include relay.wisp.talk in new user's NIP-65

When a new user finishes profile setup, OnboardingViewModel.finishProfile
saves the discovered+tested relays locally and publishes a kind 10002
relay list event. Insert wss://relay.wisp.talk into that list before
saving and publishing, so every new Wisp account advertises Wisp's relay
to the network from day one.

Read+write so the new user both publishes to and reads from it. Dedup
on URL (case-insensitive) so we don't duplicate if probing already
discovered the relay independently.

Reverts the earlier change to RelayConfig.DEFAULTS — that was the wrong
place. The DEFAULTS list is a fallback for users without an onboarding
flow; new-account injection belongs in onboarding where the relay list
event is actually constructed and published.

app/src/main/kotlin/com/wisp/app/relay/RelayConfig.kt

@@ -31,7 +31,6 @@ data class RelayConfig(
         val DEFAULTS = listOf(
             RelayConfig("wss://relay.damus.io", read = true, write = true),
             RelayConfig("wss://relay.primal.net", read = true, write = true),
-            RelayConfig("wss://relay.wisp.talk", read = true, write = true),
             RelayConfig("wss://indexer.coracle.social", read = true, write = false),
             RelayConfig("wss://relay.nos.social", read = true, write = false)
         )

app/src/main/kotlin/com/wisp/app/viewmodel/OnboardingViewModel.kt

@@ -95,6 +95,7 @@ class OnboardingViewModel(app: Application) : AndroidViewModel(app) {
 
     companion object {
         private const val TAG = "OnboardingSuggestions"
+        private const val WISP_RELAY_URL = "wss://relay.wisp.talk"
         val CREATOR_PUBKEYS = listOf(
             "3bf0c63fcb93463407af97a5e5ee64fa883d107ef9e558472c4eb9aaaefa459d", // fiatjaf
             "e2ccf7cf20403f3f2a4a55b328f0de3be38558a7d5f33632fdaaefc726c1c8eb"  // utxo
@@ -211,7 +212,15 @@ class OnboardingViewModel(app: Application) : AndroidViewModel(app) {
         signer: NostrSigner? = null
     ): Boolean {
         val s = signer ?: keyRepo.getKeypair()?.let { LocalSigner(it.privkey, it.pubkey) } ?: return false
-        val relays = _discoveredRelays.value ?: RelayConfig.DEFAULTS
+        val discovered = _discoveredRelays.value ?: RelayConfig.DEFAULTS
+        // Always include Wisp's own relay in the new account's NIP-65 list,
+        // regardless of what relay probing discovered. Read+write so the new
+        // user both publishes to and reads from it from day one.
+        val relays = if (discovered.any { it.url.equals(WISP_RELAY_URL, ignoreCase = true) }) {
+            discovered
+        } else {
+            discovered + RelayConfig(WISP_RELAY_URL, read = true, write = true)
+        }
 
         return try {
             _publishing.value = true