perf(websocket): switch WiFi to performance mode before connecting (#1985)

* perf(websocket): switch WiFi to performance mode before connecting

Optimize WebSocket connection speed by switching WiFi to performance
mode before establishing the connection, instead of after.

This reduces network latency significantly:
- TCP connection: 1093ms → 88ms (92% faster)
- WebSocket handshake: 1035ms → 80ms (92% faster)
- Total network layer: 2128ms → 173ms (92% faster)

The issue was caused by WiFi power save mode (MAX_MODEM) which adds
significant latency to packet transmission.

* Adjust formatting

main/application.cc

@@ -716,6 +716,10 @@ void Application::ContinueOpenAudioChannel(ListeningMode mode) {
         return;
     }
 
+    // Switch to performance mode before connecting to reduce latency
+    auto& board = Board::GetInstance();
+    board.SetPowerSaveLevel(PowerSaveLevel::PERFORMANCE);
+
     if (!protocol_->IsAudioChannelOpened()) {
         if (!protocol_->OpenAudioChannel()) {
             return;
@@ -825,6 +829,10 @@ void Application::ContinueWakeWordInvoke(const std::string& wake_word) {
         return;
     }
 
+    // Switch to performance mode before connecting to reduce latency
+    auto& board = Board::GetInstance();
+    board.SetPowerSaveLevel(PowerSaveLevel::PERFORMANCE);
+
     if (!protocol_->IsAudioChannelOpened()) {
         if (!protocol_->OpenAudioChannel()) {
             audio_service_.EnableWakeWordDetection(true);