Refactor .gitignore to streamline ignored files and enhance clarity. Update CLAUDE.md to improve unit test instructions and add coverage reporting details. Revise README.md for better project overview and deployment instructions. Refactor ChannelEndpoints and StreamingEndpoints to utilize SegmentFiles for file resolution, improving code maintainability. Remove unused JunctionHandlers and update DependencyInjection for cleaner service registration. Enhance media processing services for better job handling and error management. Update frontend API types for consistency and clarity.

backend/src/TeleWave.Application/Programming/Groups/GroupErrors.cs

@@ -16,11 +16,6 @@ public static class GroupErrors
         "Шоу или коллекция не найдены."
     );
 
-    public static readonly Error ElementAlreadyAdded = Error.Conflict(
-        "Groups.ElementAlreadyAdded",
-        "Этот элемент уже входит в группу."
-    );
-
     public static readonly Error FilterNotSet = Error.Validation(
         "Groups.FilterNotSet",
         "У группы не задано правило набора."