A social knowledge tool for researchers built on ATProto

refactor: use existing callerDid instead of redundant callingUserId master

Cleaned up controllers to use the existing callerDid variable directly instead of creating redundant callingUserId variables. This improves code consistency and reduces duplication. Changes: - GetMyUrlCardsController: Renamed userId to callerDid for consistency - GetUserUrlCardsController: Use callerDid instead of callingUserId - GetCollectionPageController: Removed duplicate callerDid parameter - GetCollectionPageByAtUriController: Removed duplicate callerDid parameter - GetUrlCardViewController: Removed duplicate callerDid parameter - GetGlobalFeedController: Use callerDid instead of callingUserId