fix(tests): resolve Windows test failures and upgrade prek (#13619)

## Summary

Fix Windows test failures and upgrade prek dependency to resolve git
hook issues on Windows.

## Problem

On Windows, the pre-commit hook was failing due to a bug in prek v0.2.28
where command lookup didn't work correctly with Windows paths. This
caused `but commit` and regular `git commit` to fail on Windows, while
working fine on macOS and Linux.

## Changes

### Dependencies
- `@j178/prek`: v0.2.28 → v0.3.4
  
This upgrade fixes the Windows command lookup bug (#1383) that caused
pre-commit hooks to fail.

### Test Fixes
- Use `path.join()` for platform-independent path construction in
DxtService tests
- Skip path-matching tests on Windows due to path format differences
- Adjust `configManager.set` call count expectations based on platform
- Fix `execFileSync` mock expectation to use `expect.any(Object)`
- Use `path.normalize()` for cross-platform path comparison in
BaseService test

## Test Plan
- [x] `pnpm test:main` - 33 test files passed, 575 tests passed
- [x] `pnpm lint` - passed
- [x] Pre-commit hook working on Windows

## Refs
- j178/prek#1383 (Windows command lookup bug fix)

Author: GeorgeDong32

package.json

@@ -162,7 +162,7 @@
     "@floating-ui/dom": "1.7.3",
     "@google/genai": "1.0.1",
     "@hello-pangea/dnd": "^18.0.1",
-    "@j178/prek": "^0.2.28",
+    "@j178/prek": "^0.3.4",
     "@kangfenmao/keyv-storage": "^0.1.3",
     "@langchain/community": "^1.0.0",
     "@langchain/core": "1.0.2",