Remove unused RichText import from bluesky.ts to fix CI lint failure (#1346)

The RichText import from @atproto/api was unused after refactoring the
Bluesky posting logic to use manual facets instead of RichText helpers.
This caused the ESLint no-unused-vars rule to fail in CI.

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: captbaritone

packages/skin-database/tasks/bluesky.ts

@@ -5,7 +5,6 @@ import {
   AppBskyRichtextFacet,
   AtpAgent,
   BlobRef,
-  RichText,
 } from "@atproto/api";
 import {
   TWEET_BOT_CHANNEL_ID,