feat: add unit tests

[Robert27]

This pull request introduces several changes, primarily focusing on adding new tests, updating dependencies, and enhancing the handling of manual campus life events in the database. Below is a summary of the most important changes:

New Tests Added:

• Added tests for auth-utils to verify the behavior of the checkAuthorization function under various conditions.
• Added tests for date-utils to ensure correct functionality of date manipulation functions such as formatISODate, getMonday, and addWeek.
• Added tests for food-utils to validate functions like cleanMealFlags, capitalize, and unifyFoodEntries.

Dependency Updates:

• Updated package.json to include new dependencies: @vitest/coverage-v8, vite-tsconfig-paths, and vitest. [1] [2]

Manual Campus Life Events:

• Created a new table manual_cl_events to store manual campus life event details, including title, description, start and end dates, organizer, and URLs.
• Added a new schema definition for manual_cl_events in manualClEvents.ts.
• Implemented mutations for deleting (deleteManualClEvent) and upserting (upsertManualClEvent) manual campus life events. [1] [2]
• Updated the clEvents query to combine Moodle events with manually added campus life events and cache the results.

Miscellaneous:

• Replaced Bun.env.NODE_ENV with process.env.NODE_ENV in index.ts for consistency.
• Added .returning() to delete mutations for consistency in returning deleted rows. [1] [2]

These changes collectively enhance the testing coverage, update dependencies, and improve the handling of manual campus life events in the application.