Fix UnboundLocalError in checkout endpoint

[idosun]

Define 'quantities' variable before checking its length to prevent UnboundLocalError when validating cart data. This was causing HTTP 500 errors when the Android app attempted to checkout.

Fixes ANDROID-CJ

[vercel]

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
empower	Ignored		Mar 4, 2026 7:10pm

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 22.01%. Comparing base (743e6e1) to head (0466a38).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
flask/src/main.py	0.00%	1 Missing ⚠️

❌ Your patch check has failed because the patch coverage (0.00%) is below the target coverage (50.00%). You can increase the patch coverage or adjust the target coverage.
❌ Your project check has failed because the head coverage (22.01%) is below the target coverage (35.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1323   +/-   ##
=======================================
  Coverage   22.01%   22.01%           
=======================================
  Files          42       42           
  Lines        1363     1363           
  Branches      176      176           
=======================================
  Hits          300      300           
- Misses       1036     1037    +1     
+ Partials       27       26    -1     

Flag	Coverage Δ
api	5.83% <0.00%> (ø)
frontend	32.33% <ø> (ø)

Components	Coverage Δ
checkout_module	5.83% <0.00%> (ø)
product_component	25.98% <ø> (ø)

Files with missing lines	Coverage Δ
flask/src/main.py	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes

[idosun]

@sentry review