Refactor Discord channel resource management and update imports

- Consolidated channel type definitions by moving them to discord-channel-types.ts for better organization.
- Removed redundant DASHBOARD_CHANNEL_TYPES and updated exports to streamline channel handling in the application.
- Enhanced type safety by utilizing the ChannelKind type in the discord-channel-select component.

apps/webui/src/components/ui/discord-channel-select.tsx

@@ -16,11 +16,9 @@ import {
 import { DiscordResourceMultiSelect } from '@/components/ui/discord-resource-multi-select';
 import { Popover, PopoverContent, PopoverTrigger } from '@/components/ui/popover';
 import { useGuildChannels } from '@/hooks/use-guild-channels';
-import { CHANNEL_TYPES, channelPrefix } from '@/lib/discord-guild-resources';
+import { CHANNEL_TYPES, channelPrefix, type ChannelKind } from '@/lib/discord-channel-types';
 import { cn } from '@/lib/utils';
 
-type ChannelKind = keyof typeof CHANNEL_TYPES;
-
 function filterChannels(
   channels: DiscordChannelOption[],
   kinds: ChannelKind[] | undefined