Fix diagram error

[danielfromearth]

An error in docs/CI_CD_ARCHITECTURE_DIAGRAM.md is caused by nested square brackets in the Mermaid diagram syntax. Square brackets are used to define node shapes in Mermaid, so having [skip ci] inside the node text RT[Push with [skip ci]] creates a syntax conflict. By wrapping the text in quotes (RT["Push with [skip ci]"]), Mermaid will correctly parse the square brackets as part of the text content rather than syntax elements.

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📚 Documentation preview 📚: https://stitchee--323.org.readthedocs.build/en/323/

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.63%. Comparing base (a8e74a9) to head (c6eb22f).

Additional details and impacted files

@@                         Coverage Diff                          @@
##           feat/issue-295-uv-instead-of-poetry     #323   +/-   ##
====================================================================
  Coverage                                90.63%   90.63%           
====================================================================
  Files                                        9        9           
  Lines                                      470      470           
====================================================================
  Hits                                       426      426           
  Misses                                      44       44           

Flag	Coverage Δ
unittests	90.63% <ø> (ø)

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