Fix Windows entry glob separators

[Peter7896]

Closes #66

Summary

• Normalizes Windows backslash entry globs before passing them to glob.
• Keeps displayed dependency tree paths stable with forward slashes after path.relative on Windows.
• Covers the packages\shared\src\index.ts entry case with a parser regression test.

Validation

• npm install --package-lock=false --ignore-scripts --no-audit --no-fund
• npx tsx src\bin\dpdm.ts .\src\index.ts --tree false --circular false --warning false --progress false
• npx vitest run src\parser.spec.ts
• npx vitest run
• npm run typecheck
• npx prettier --check src\parser.ts src\bin\dpdm.ts src\parser.spec.ts src\utils.ts
• git diff --check