fix: remove 'bar' from CLI PLACEHOLDER_PATTERN, clean up dead code

- Remove 'bar' from analyzer.py PLACEHOLDER_PATTERN (too common a word
  used by tqdm, matplotlib, etc.) — consistent with web API fix
- Remove unused 'field' import from web/api/roast.py
- Remove unused LONG_FUNCTION_LINES constant from web/api/roast.py
- Move SENSITIVE_URL_PATTERN to module level (avoids recompilation per call)

🤖 Generated with Codebuff
Co-Authored-By: Codebuff <noreply@codebuff.com>

Author: Rohan5commit