Remove proxy feature

[Copilot]

Brief summary of changes

• Removed proxy server functionality (server acting as client to remote proxy)
• Removed get_pinpoint_id Socket.IO event
• Removed CLI flags: --use-proxy, --proxy-address
• Removed GUI fields for proxy configuration
• Simplified server initialization to local-only mode

Notes

Server now only operates in direct mode. The use_proxy and proxy_address fields remain in EphysLinkOptions (external dependency) but are ignored. Net -225 LOC.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Remove Proxy</issue_title>
<issue_description>No longer supported feature. Remove all code that activates a proxy server, meaning the server is a client type instead of a server type. Remote events for checking a proxy or pinpoint id for validating a proxy connection. Remove any CLI and GUI options to enable to proxy feature. Update docs to remove discussion of the proxy feature. </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Remove Proxy #472

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[Copilot]

Pull request overview

This PR removes the deprecated proxy feature from Ephys Link, eliminating the ability to run the server as a proxy client. The changes simplify the codebase by removing proxy-related configuration options, initialization logic, event handlers, and associated tests.

• Removed proxy-related CLI arguments (--use-proxy, --proxy-address) and GUI fields
• Simplified server initialization to only support direct server mode (removed proxy client logic)
• Removed proxy-related event handler (get_pinpoint_id) and associated constants
• Updated tests and documentation to reflect the removal of proxy functionality

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/back_end/test_server.py	Removed proxy client tests and unused imports; simplified server fixture initialization
src/ephys_link/utils/constants.py	Removed proxy-related error constants (SERVER_NOT_INITIALIZED_ERROR, PROXY_CLIENT_NOT_INITIALIZED_ERROR)
src/ephys_link/front_end/gui.py	Removed proxy-related GUI fields (use_proxy checkbox, proxy_address entry) and adjusted grid layout
src/ephys_link/front_end/cli.py	Removed proxy-related CLI arguments (--use-proxy, --proxy-address)
src/ephys_link/back_end/server.py	Simplified server initialization by removing proxy client logic, AsyncClient imports, and pinpoint_id generation
docs/development/socketio_api.md	Removed documentation for the deprecated get_pinpoint_id event

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