feat: Optimize potato calculations and notifications

[seer-by-sentry]

Fixes GIBPOTATO-BACKEND-NK. The issue was that: Uncached potatoSentToday and potatoLeftToday methods execute identical SUM queries multiple times during validation and notification.

• Cache the result of potatoSentToday() to avoid duplicate queries.
• Reuse the cached result from potatoSentToday() in potatoLeftToday().
• Pass the pre-computed potatoLeftToday value to the notification service to avoid re-querying.

This fix was generated by Seer in Sentry, triggered by Michi Hoffmann. 👁️ Run ID: 2903740

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[codecov]

Bundle Report

Bundle size has no change ✅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 26.04%. Comparing base (b6005c8) to head (1d9a1e1).

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #366      +/-   ##
============================================
- Coverage     26.20%   26.04%   -0.16%     
- Complexity      323      324       +1     
============================================
  Files            77       77              
  Lines          3247     3240       -7     
============================================
- Hits            851      844       -7     
  Misses         2396     2396              

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