feat(cache-manager): Implement CacheManager class with LRU caching and file operations

[DarkPhoenix42]

No description provided.

[Copilot]

Pull Request Overview

This PR adds a new CacheManager class to implement LRU caching for file operations, along with a comprehensive suite of unit tests.

• Adds unit tests in tests/unittests/server/cache_manager_test.cpp to cover read, write, append, cache invalidation, clear cache, LRU eviction, and concurrent reads.
• Implements a CacheManager class in src/server/cache_manager.cpp using file system operations and LRU tracking.
• Updates supporting files: renames a helper in src/common/file_operations.cpp and removes the unused mutex from ConnectionManager in src/client/connection_manager.cpp and include/client/connection_manager.hpp.

Reviewed Changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/unittests/server/cache_manager_test.cpp	New tests covering all aspects of the CacheManager functionality
src/server/cache_manager.cpp	Implementation of CacheManager with LRU caching, file read/write, append
src/common/file_operations.cpp	Renamed helper function for improved consistency
src/client/connection_manager.cpp	Removed redundant mutex locking from disconnect method
include/server/cache_manager.hpp	Declaration and documentation of the CacheManager interface
include/client/connection_manager.hpp	Removed the m_socket_mutex field to align with ConnectionManager update

Files not reviewed (1)

• tests/unittests/server/CMakeLists.txt: Language not supported

Comments suppressed due to low confidence (1)

src/client/connection_manager.cpp:171

• The removal of the mutex lock in disconnect() may affect thread safety when accessing m_server_socket. Please verify that appropriate synchronization is maintained.

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[v1bh475u]

Believing the conversion from std::vector<uint8_t> to std::string is done to remove the current hassle about handling the data properly, I approve your changes.