fix: Add model name validation for model management requests

[pskiran1]

This pull request adds input validation for model names in model management requests to prevent path traversal attacks. The validation ensures that model names used in the load operation cannot contain directory traversal sequences or path separators that could be exploited to access files outside the intended model repository.

CI: triton-inference-server/server#8672

[Copilot]

Pull request overview

This pull request adds input validation for model names in model management requests to prevent path traversal attacks. The validation ensures that model names used in load/unload operations cannot contain directory traversal sequences or path separators that could be exploited to access files outside the intended model repository.

Changes:

• Added ValidateModelName function to check for empty names and path traversal characters (.., /, )
• Integrated validation into LoadUnloadModel to protect the model loading/unloading entry point
• Updated copyright year to 2026

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[yinggeh]

Well done