fix(otto): WebSocket direct clients not receiving MCP responses (#1992)

* Enhance Otto Robot camera support by adding configuration for OV3660. Updated config.h to define camera types and GPIO settings, modified config.json to include new camera options, and refactored otto_robot.cc for improved camera detection and initialization logic.

* fix: 移除 OttoEmojiDisplay 构造函数中的 SetTheme 调用以修复 LoadProhibited 崩溃

Made-with: Cursor

* refactor: improve audio service error handling and codec timeout management

- Updated AudioService to prevent input task termination on read timeout, introducing a delay instead.
- Enhanced NoAudioCodec to implement a read timeout for I2S channel reads.
- Adjusted WebSocketControlServer to set a control port for improved socket management.
- Added manufacturer information to the config.json for waveshare ESP32-Touch-LCD-3.5.

* fix(otto): WebSocket direct clients not receiving MCP responses

When a browser connects directly to the WebSocket control server (port
8080) and sends a JSON-RPC request, the MCP response was routed through
Application::SendMcpMessage -> protocol_->SendMcpMessage, which sends it
to the cloud protocol channel. As a result, the direct WebSocket client
never received the response, while the WeChat mini-program could because
it communicates via the cloud.

Fix:
- Add BroadcastMessage() to WebSocketControlServer, using
  httpd_queue_work + httpd_ws_send_frame_async to asynchronously
  send responses back to all connected clients on port 8080
- Add RegisterMcpBroadcastCallback() to Application, allowing an
  additional MCP send callback to be registered; SendMcpMessage()
  now invokes it alongside the cloud protocol
- Register the broadcast callback in OttoRobot after the WebSocket
  server starts successfully

Also add WebSocket direct-connect API documentation to README.md
with complete JSON-RPC 2.0 command examples.

main/application.h

@@ -10,6 +10,7 @@
 #include <mutex>
 #include <deque>
 #include <memory>
+#include <functional>
 
 #include "protocol.h"
 #include "ota.h"
@@ -108,6 +109,7 @@ public:
     bool UpgradeFirmware(const std::string& url, const std::string& version = "");
     bool CanEnterSleepMode();
     void SendMcpMessage(const std::string& payload);
+    void RegisterMcpBroadcastCallback(std::function<void(const std::string&)> callback);
     void SetAecMode(AecMode mode);
     AecMode GetAecMode() const { return aec_mode_; }
     void PlaySound(const std::string_view& sound);
@@ -136,6 +138,8 @@ private:
     AudioService audio_service_;
     std::unique_ptr<Ota> ota_;
 
+    std::function<void(const std::string&)> mcp_broadcast_callback_;
+
     bool has_server_time_ = false;
     bool aborted_ = false;
     bool assets_version_checked_ = false;