chore: align frontend tooling with bun

rules.md

@@ -139,7 +139,7 @@ git commit -m "docs: update API documentation"
 
 # Before opening PR
 git fetch origin && git rebase origin/main
-pytest && npm run lint
+./.venv/bin/python -m pytest -s backend/tests && bun run build
 ```
 
 **Rules:**
@@ -156,7 +156,7 @@ pytest && npm run lint
 - Verify package legitimacy before adding
 - Prefer well-maintained, widely-used libraries
 - Pin dependency versions in `requirements.txt` and `package.json`
-- Review security advisories with `pip-audit` and `npm audit`
+- Review security advisories with `pip-audit` and `bun audit`
 - **NEVER** add unknown packages
 
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