refractor(core): centralize normalize_windows_path utility

[dharapandya85]

Description

Briefly explain what this PR does and why it is necessary.
This PR removes duplicated normalize_windows_path implementation from arbitar-forge/src/main.rs and maintains it in arbiter-core/src/lib.rs.

Related Issue

Closes #29 [Insert Issue Number]

Checklist

• I have read the CONTRIBUTING.md guidelines.
• [x ] My code passes cargo clippy -- -D warnings and cargo fmt.
• I have included rationale-only comments for complex logic.
• I have added or updated unit tests (if applicable).

AI-Generated Code Compliance

• This PR contains code generated or assisted by an LLM.
• I have manually reviewed, tested, and verified every line of this code. Any issues faced, created or caused by the code are my own fault.
• I can fully explain the low-level mechanics of this implementation and guarantee it does not introduce memory leaks, race conditions, or undefined behavior.

[Sid-352]

@dharapandya85 Code itself is decent, works well and centralized. However, there are two quick things to fix before we can merge:

• Failing Test: In removes_trailing_slash, the assertion checks for r"C\:temp\folder" instead of r"C:\temp\folder". Please fix the typo and verify that cargo test actually passes locally.
• Dead Code: Completely delete the commented-out function block in arbiter-forge/src/main.rs. We don't need to leave commented code behind.

Push those fixes and I'll get this merged.

[Sid-352]

Merged, thanks