refactor: generalized pb message format and added an App manager

[Aditya-ds-1806]

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[Copilot]

Pull request overview

This pull request implements websocket tunneling by refactoring the protocol buffer message structure and introducing a new Message wrapper type. The changes move from a model where Request and Response messages had their own ID fields to a unified Message wrapper with a message_id field that can contain different payload types (Request, Response, or Socket). The PR also refactors app management into a separate package with improved lifecycle management.

Changes:

• Introduced new Message protobuf wrapper with message_id and oneof payload for Request/Response/Socket types
• Removed id fields from Request and Response protobuf messages and renumbered remaining fields
• Refactored app management into internal/server/app package with AppRegistry for centralized app tracking
• Changed WebSocket registration endpoint from /ws to /register
• Implemented channel-based message subscription system for request-response correlation

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 24 comments.

Show a summary per file

File	Description
protos/message.proto	New Message wrapper definition with oneof payload
protos/request.proto	Removed id field, renumbered fields
protos/response.proto	Removed id field, renumbered fields
internal/server/server.go	Refactored to use new app package and message subscription system
internal/server/app/appRegistry.go	New global registry for app management with mutex protection
internal/server/app/app.go	New app abstraction with channel-based message handling and lifecycle management
internal/client/client.go	Updated to use new Message wrapper for protocol communication
borepb/*.pb.go	Generated protobuf Go code for new message definitions
Makefile	Added -I flag to protoc command for proper import resolution

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