fix: onboarding auth, stale CI build, autocomplete attrs

- Add identity.create + server.echo to UNAUTHENTICATED_METHODS
- Clear web/dist before frontend build to prevent stale artifacts
- Add autocomplete attrs to login inputs

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

core/archipelago/src/api/rpc/middleware.rs

@@ -11,11 +11,14 @@ pub(super) const UNAUTHENTICATED_METHODS: &[&str] = &[
     "auth.setup",
     "auth.onboardingComplete",
     "health",
+    // Server readiness check (Login.vue polls this before showing form)
+    "server.echo",
     // Onboarding flow (before user has a session — DID creation, signing, backup)
     "node.did",
     "node.signChallenge",
     "node.nostr-pubkey",
     "node.createBackup",
+    "identity.create",
     "identity.verify",
     "identity.resolve-did",
     // Onboarding restore (before user account exists)