Fixes

Fixes #2689 by @AetherUnbound

Description

This PR updates the default value for BASE_URL on the API (which is the value that ends up being used in production) from openverse.org to api.openverse.engineering. The BASE_URL value is used in media reports to construct the item URL, and was constructing an incorrect URL which had the path components of the API but pointed to the frontend. Since this is a computed field, simply deploying this change should correct all the links provided on each of those tables.

Testing Instructions

1. Set BASE_URL=https://openverse.org/ in your api/.env file
2. Run just api/init to start the API
3. Run API_URL=http://localhost:50270 just frontend/run dev:only to start the frontend
4. Navigate to an image result on the frontend, and submit a report
5. Visit http://localhost:50280/admin/api/imagereport/ and observe that the URL shows up as https://openverse.org/<api-media-url>, which is incorrect
6. Change the api/.env value to be BASE_URL=http://localhost:50280/, restart the API, and visit the above page to observe the difference

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