fix(connectors): share Discord max-messages default across meta and runtime

Discord defined DEFAULT_MAX_MESSAGES separately in meta.ts (config placeholder)
and discord.ts (sync behavior), which could drift. Export it from meta.ts and
import it in the runtime, matching the single-source pattern used by the other
connectors (e.g. gmail, intercom).

Author: waleedlatif1

apps/sim/connectors/discord/discord.ts

@@ -1,14 +1,13 @@
 import { createLogger } from '@sim/logger'
 import { getErrorMessage, toError } from '@sim/utils/errors'
 import { fetchWithRetry, VALIDATE_RETRY_OPTIONS } from '@/lib/knowledge/documents/utils'
-import { discordConnectorMeta } from '@/connectors/discord/meta'
+import { DEFAULT_MAX_MESSAGES, discordConnectorMeta } from '@/connectors/discord/meta'
 import type { ConnectorConfig, ExternalDocument, ExternalDocumentList } from '@/connectors/types'
 import { computeContentHash, parseTagDate } from '@/connectors/utils'
 
 const logger = createLogger('DiscordConnector')
 
 const DISCORD_API_BASE = 'https://discord.com/api/v10'
-const DEFAULT_MAX_MESSAGES = 1000
 const MESSAGES_PER_PAGE = 100
 
 interface DiscordMessage {

apps/sim/connectors/discord/meta.ts

@@ -1,7 +1,7 @@
 import { DiscordIcon } from '@/components/icons'
 import type { ConnectorMeta } from '@/connectors/types'
 
-const DEFAULT_MAX_MESSAGES = 1000
+export const DEFAULT_MAX_MESSAGES = 1000
 
 export const discordConnectorMeta: ConnectorMeta = {
   id: 'discord',