Refactor for cleanliness

[lionkor]

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[Copilot]

Pull Request Overview

This PR refactors various components for improved cleanliness and structure, with an emphasis on enhanced startup configuration and clearer separation between connection server components. The changes include adding environment variable placeholders, updating the echoserver binding with additional logging, and refactoring the connserver module to use a dedicated MasterDuplex interface.

Reviewed Changes

Copilot reviewed 13 out of 15 changed files in this pull request and generated no comments.

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File	Description
mount/example.env	Added commented-out environment variable placeholders.
examples/echoserver/src/main.rs	Updated binding address to be more permissive and added a startup log.
docker-compose.yml	Introduced service definitions for voltlane-connserver and backend-server.
connserver/src/master.rs	Added a new MasterDuplex trait and its TcpMasterDuplex implementation.
connserver/src/main.rs	Refactored to use the new ConnServer API with master duplex connection.
connserver/src/connserver.rs	Updated server implementation to accept a MasterDuplex instance at runtime.
connserver/src/connection/{mod.rs, client.rs}	Added modular client handling for improved connection management.
connserver/src/config.rs	Introduced fill_from_env for configuration via environment variables.
connserver/Cargo.toml	Added dependencies for async-trait and dotenvy.
Dockerfile.example_echoserver	Provided build instructions for the sample echoserver.
Dockerfile	Provided build instructions for connserver.
.dockerignore	Added common patterns to ignore.