test: init e2e

[hyoban]

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Summary

fixes #32473

Screenshots

Before	After
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Checklist

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran make lint and make type-check (backend) and cd web && npx lint-staged (frontend) to appease the lint gods

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.75%. Comparing base (5a8a68c) to head (f8a3d1c).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #34193      +/-   ##
==========================================
- Coverage   81.75%   81.75%   -0.01%     
==========================================
  Files        4718     4718              
  Lines      187981   187981              
  Branches    36733    36733              
==========================================
- Hits       153693   153692       -1     
  Misses      30855    30855              
- Partials     3433     3434       +1     

Flag	Coverage Δ
api	80.51% <ø> (-0.01%)	⬇️

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