refactor: replace welcome message with server_info status payload

Unify the initial connection handshake and capability update paths.
The server now sends a server_info status message on connect and
whenever capabilities change, enabling the onboarding flow where
voice becomes available after models are configured.

packages/app/src/contexts/session-context.tsx

@@ -1100,19 +1100,6 @@ function SessionProviderInternal({
       if (message.type !== "status") return;
       const serverInfo = parseServerInfoStatusPayload(message.payload);
       if (serverInfo) {
-        console.info(
-          `[Session] server_info received ${JSON.stringify({
-            serverId,
-            payloadServerId: serverInfo.serverId,
-            hostname: serverInfo.hostname,
-            version: serverInfo.version,
-            capabilitiesPresent: Boolean(serverInfo.capabilities),
-            dictationCapabilityEnabled:
-              serverInfo.capabilities?.voice?.dictation?.enabled ?? null,
-            dictationCapabilityReason:
-              serverInfo.capabilities?.voice?.dictation?.reason ?? null,
-          })}`
-        );
         updateSessionServerInfo(serverId, {
           serverId: serverInfo.serverId,
           hostname: serverInfo.hostname,