Add daily rotating recommended category endpoint#53

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Copilot wants to merge 3 commits intodevelopfrom

copilot/add-recommended-category-tab

Commits on Jan 22, 2026

Initial plan
Copilot
committed
Add today's recommended category tab endpoint with daily rotation

Copilot
and
neibler
committed
Improve getTodayRecommendedCategories: store LocalDate in variable and validate cache size

Copilot
and
neibler
committed