style: lint and format src/djehuty/web/formatter.py with ruff, enforce

[641e16]

Note: Stacked on #173 — only the last two commits are new here;
I'll rebase onto main once #173 merges.

Summary

Next slice of the incremental Ruff rollout (#66): lints and formats src/djehuty/web/formatter.py and adds it to the enforced scope. Split into a mechanical commit (pure ruff check --fix + ruff format output, safe to skim) and a manual commit (the four violations ruff could not auto-fix, worth review). The issue offered separate PRs if the diff ran large; the manual remainder is four wrapped lines, so one PR with two commits.

Changes

• src/djehuty/web/formatter.py (commit 1, mechanical): apply ruff check --fix (import sorting) and ruff format. No functional changes.
• src/djehuty/web/formatter.py (commit 2, manual): wrap four over-long URL f-strings via implicit concatenation; the resulting strings are byte-identical.
• justfile: add the file to lint_paths so just lint and CI enforce it.

Approval Checklist

• I agree to follow Djehuty's code of conduct.
• I have read and I have follow the code contribution workflow.
• Code style and conventions were respected.
• Documentation has been updated where needed (README, docs, or examples).
• Review approved by at least one maintainer.
• Merge readiness (PR is squashed into a single commit and follows the commit template).

Issue Reference

Closes #145 (part of #66)

Screenshots

Green CI run on my fork with the Lint job covering the extended scope:
https://github.com/641e16/djehuty/actions/runs/29340878477

Notes

• Verified: just lint green on the full scope; unit tests 157/157.

[codecov]

Codecov Report

❌ Patch coverage is 42.01681% with 138 lines in your changes missing coverage. Please review.
✅ Project coverage is 17.49%. Comparing base (1a4ecd1) to head (8b5b2a4).

Files with missing lines	Patch %	Lines
src/djehuty/utils/convenience.py	33.33%	56 Missing and 2 partials ⚠️
src/djehuty/web/formatter.py	38.20%	55 Missing ⚠️
src/djehuty/utils/rdf.py	56.89%	23 Missing and 2 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #180   +/-   ##
=======================================
  Coverage   17.49%   17.49%           
=======================================
  Files          21       21           
  Lines       10217    10217           
  Branches     1977     1977           
=======================================
  Hits         1787     1787           
  Misses       8241     8241           
  Partials      189      189           

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