fix: CI biome errors + enhanced GUILD_CREATE/READY voice_states diagnostic

- live-speaker.ts: unused var [id] in clearAllSpeakers → [_]
- migrate.ts: useTemplate string concat → template literal
- streamWatchReceiver: remove unused watchKey param from closeCurrentSegment
- videoRecorder: log all raw WS event types + READY sessions.voice + broadcaster_user_ids

services/discord-gateway/src/shared/database/migrate.ts

@@ -194,8 +194,7 @@ async function seedDrizzleHistory(client: PoolClient): Promise<void> {
   // recorded). Seed up to the last journal `when` so Drizzle skips them
   // instead of re-running already-applied DDL and crashing. This is the
   // recovery that broke the gateway's infinite-restart loop.
-  const journalTag =
-    (await getFirstMigrationTag()) + `@${lastMigrationWhen}-reconciled`;
+  const journalTag = `${await getFirstMigrationTag()}@${lastMigrationWhen}-reconciled`;
   await client.query(
     `INSERT INTO "__drizzle_migrations" (hash, created_at) VALUES ($1, $2)`,
     [journalTag, lastMigrationWhen],