fix: add cors and allowed_origins to server standalone parameters

[vansangpfiev]

Describe Your Changes

This pull request refactors the server setup and configuration process in the engine/main.cc file by introducing a ServerParams struct and a SetupServer function. Additionally, it updates command-line argument handling and help text to reflect these changes.

Key changes include:

Refactoring server setup:

• Introduced the ServerParams struct to encapsulate server parameters such as server_host, server_port, api_keys, cors, and allowed_origins. ([engine/main.ccL63-R102](https://github.com/janhq/cortex.cpp/pull/2177/files#diff-8651ef9f256f38a44086c44bf92b235f3486b0b555bb4c56632e9a54d01f40c5L63-R102))
• Added the SetupServer function to handle server configuration updates based on the ServerParams struct. ([engine/main.ccL63-R102](https://github.com/janhq/cortex.cpp/pull/2177/files#diff-8651ef9f256f38a44086c44bf92b235f3486b0b555bb4c56632e9a54d01f40c5L63-R102))
• Modified the RunServer function to no longer accept host and port parameters, as these are now handled by SetupServer. ([[1]](https://github.com/janhq/cortex.cpp/pull/2177/files#diff-8651ef9f256f38a44086c44bf92b235f3486b0b555bb4c56632e9a54d01f40c5L84-L100), [[2]](https://github.com/janhq/cortex.cpp/pull/2177/files#diff-8651ef9f256f38a44086c44bf92b235f3486b0b555bb4c56632e9a54d01f40c5L571-R600))

Updating command-line argument handling:

• Updated command-line argument parsing to populate the ServerParams struct instead of individual variables. ([[1]](https://github.com/janhq/cortex.cpp/pull/2177/files#diff-8651ef9f256f38a44086c44bf92b235f3486b0b555bb4c56632e9a54d01f40c5L464-R486), [[2]](https://github.com/janhq/cortex.cpp/pull/2177/files#diff-8651ef9f256f38a44086c44bf92b235f3486b0b555bb4c56632e9a54d01f40c5L480-R512), [[3]](https://github.com/janhq/cortex.cpp/pull/2177/files#diff-8651ef9f256f38a44086c44bf92b235f3486b0b555bb4c56632e9a54d01f40c5L502-R542))
• Added support for new command-line arguments --cors and --allowed_origins. ([[1]](https://github.com/janhq/cortex.cpp/pull/2177/files#diff-8651ef9f256f38a44086c44bf92b235f3486b0b555bb4c56632e9a54d01f40c5L480-R512), [[2]](https://github.com/janhq/cortex.cpp/pull/2177/files#diff-8651ef9f256f38a44086c44bf92b235f3486b0b555bb4c56632e9a54d01f40c5L502-R542))

Improving help text:

• Updated the help text to include the new --cors argument and renamed --api_configs to --api_keys. ([engine/main.ccL437-R459](https://github.com/janhq/cortex.cpp/pull/2177/files#diff-8651ef9f256f38a44086c44bf92b235f3486b0b555bb4c56632e9a54d01f40c5L437-R459))

Minor changes:

• Added a missing newline at the end of the AreUrlPathsEqual function in engine/utils/string_utils.h. ([engine/utils/string_utils.hR231](https://github.com/janhq/cortex.cpp/pull/2177/files#diff-7b4479b6eba1e98453848526c53fda755811ed5017fa743307d6ed174a0ee580R231))

Fixes Issues

• Closes #
• Closes #

Self Checklist

• Added relevant comments, esp in complex areas
• Updated docs (for bug fixes / features)
• Created issues for follow-up changes or refactoring needed