chore: replace cheerio with htmlparser2

[trivikr]

Replace cheerio with the lighter, purpose-built htmlparser2, avoiding the additional DOM and query abstractions we do not use.

The project only needs document text and <a> text/href values, so Cheerio’s selector and manipulation APIs are unnecessary. Using htmlparser2 callbacks preserves the existing behavior without constructing a DOM, while reducing the total dependency count.

Comparison between the two packages: https://npmx.dev/compare?packages=cheerio,htmlparser2

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Assisted-by: codex:gpt-5.6-sol

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.10%. Comparing base (c903a16) to head (eac8cb9).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1176      +/-   ##
==========================================
+ Coverage   57.81%   58.10%   +0.28%     
==========================================
  Files          53       53              
  Lines       10398    10410      +12     
==========================================
+ Hits         6012     6049      +37     
+ Misses       4386     4361      -25     

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