feat: implement server functionality

[v1bh475u]

closes #61
closes #62

[Copilot]

Pull Request Overview

This PR implements core server functionality and updates the client‐server connection handling while improving logging configuration and test coverage. Key changes include refactoring the client handler interface (from ClientHandler to IClientHandler), updating connection helper functions to return a status flag along with ClientInfo, and integrating enhanced logging in server/client modules.

Reviewed Changes

Copilot reviewed 20 out of 20 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/unittests/server/server_connection_manager_test.cpp	Updated mock client handler inheritance and modified the test client connection helper to return a status flag.
src/server/server.cpp, connection_manager.cpp	Added and improved logging, adjusted client handling logic and non‐blocking mode configuration.
src/server/main.cpp, src/client/main.cpp	Revised logging initialization and command-line argument parsing.
include/server/, include/common/	Updated interfaces and documentation to reflect the new client_handler abstraction and logging enhancements.
src/common/file_operations.cpp	Revised file modified time retrieval using std::chrono conversion.

Comments suppressed due to low confidence (2)

include/server/connection_manager.hpp:88

• Ensure that all references to the client handler use the updated interface (IClientHandler) consistently across the codebase and update any related comments/documentation to avoid confusion with the deprecated ClientHandler.

void set_client_handler(std::unique_ptr<IClientHandler> handler);

src/client/client.cpp:149

• [nitpick] Verify that updating the current directory using response.data() consistently reflects the intended server response format for 'cd' commands, and consider renaming variables if necessary for clarity.

m_tui->update_current_directory(response.data());

[Copilot]

Update the documentation/comments for 'connect_test_client' to reflect that it now returns a pair containing both ClientInfo and a boolean flag indicating connection success.

[DarkPhoenix42]

LGTM!