feat(worker): add index queue and wire Meilisearch indexing after approval

Adds index.queue.ts and index.processor.ts to handle BullMQ indexing jobs,
updates main.ts to create a Meilisearch client, configure the index on startup,
and enqueue index + forward jobs from ApprovalResult after a star reaction.

pnpm-lock.yaml

@@ -154,6 +154,9 @@ importers:
       '@tower/logger':
         specifier: workspace:*
         version: link:../../packages/logger
+      '@tower/search':
+        specifier: workspace:*
+        version: link:../../packages/search
       '@tower/types':
         specifier: workspace:*
         version: link:../../packages/types