Fix Warnings

[CanerKaraca23]

• Fix all warnings for clean build.
• Fix CI not using Clang 23.

[CanerKaraca23]

After merge, i will try to fix by code instead of suppressing warnings with flags.

[Copilot]

Pull request overview

This PR updates the project’s build configuration to reduce compiler warnings and adjusts CI so Clang 23 is installed and preferred during the Linux build.

Changes:

• Expanded Clang compile flags in xmake.lua (including additional warning suppressions) and adjusted release optimization level.
• Updated the GitHub Actions workflow to install Clang 23 via LLVM’s installer script and prefer LLVM 23 binaries on PATH.
• Tweaked CI compile flags used when building the cached plugin-sdk artifact and removed an extra --cxflags override from the xmake invocation.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
xmake.lua	Adds/adjusts Clang flags for warning cleanup and changes release optimization to fastest.
.github/workflows/build.yml	Installs and prefers Clang 23 in CI; updates download method and CI clang flag set.

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