feat: ai billing

[Xazin]

Feature Preview

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PR Checklist

• My code adheres to AppFlowy's Conventions
• I've listed at least one issue that this PR fixes in the description above.
• I've added a test(s) to validate changes in this PR, or this PR only contains semantic changes.
• All existing tests are passing.

[github-actions]

🥷 Ninja i18n – 🛎️ Translations need to be updated

Project /project.inlang

lint rule	new reports	level	link
Missing translation	1468	warning	contribute (via Fink 🐦)
Message without source	34	warning	contribute (via Fink 🐦)
Identical pattern	22	warning	contribute (via Fink 🐦)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.40%. Comparing base (c122f0a) to head (a08c0b8).
Report is 69 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5741      +/-   ##
==========================================
- Coverage   86.74%   81.40%   -5.34%     
==========================================
  Files         217      214       -3     
  Lines        5032     5491     +459     
  Branches      831      869      +38     
==========================================
+ Hits         4365     4470     +105     
- Misses        561      924     +363     
+ Partials      106       97       -9     

Flag	Coverage Δ
appflowy_web_app	81.40% <ø> (-5.34%)	⬇️

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