Backend:
- room_ai_list: batch-fetch models, skip entries where model_name
cannot be resolved (instead of falling back to "AI {uid}")
- room_ai_upsert: return None for model_name when lookup fails
(instead of "AI {uid}")
Frontend:
- room-context: discard configs with missing modelName after retries
- DiscordMemberList: filter out configs without modelName
- MessageInput: filter out configs without modelName
- RoomSettingsPanel: prefer model_name from API, fallback to
availableModels lookup, never render raw UID
- RoomAiTasksPanel: fix broken id/name mapping (was cfg.id/cfg.name
which don't exist), filter out configs without model_name
