Task A (#126): new non-polymorphic ScheduleItemResponseModel /
ScheduleItemsResponseModel in Core/Api/Scheduling, plus shared
NamedIdResponseModel. ScheduleItemResponseMapper flattens the
One/Flood/Multiple/Duration VM hierarchy. ScheduleController GET/POST/PUT
items now return the flat DTOs.
Task B: GET /api/languages (LanguagesController + LanguageCodeResponseModel);
GET /api/channels/music-video-credits-templates and
GET /api/channels/stream-selectors; FillerKind added to
FillerPresetResponseModel with optional ?fillerKind= filter on
GET /api/filler-presets.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
timothyandClaude Fable 5
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