Multi-protocol Support (WebSocket/gRPC)

[CodeMaverick-143]

HTTP is not enough for real-time or high-performance internal communication.

Technical Implementation:

• Extend the App class to support attaching other servers.
• WebSocket: Integrate ws library, allowing app.ws('/path', handler).
• gRPC: Integrate @grpc/grpc-js, allowing definition of services alongside HTTP routes.

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Acceptance Criteria:

• A single server instance handles both HTTP requests and WebSocket connections.