fix(queue): remove the dead {search-queue} — producers with no consumer (#379)

The {search-queue} BullMQ queue had producers on every page/space/workspace change
but NO consumer/@Processor — it lives in Docmost's EE edition (external search
drivers), never in this fork. Search works independently via the pages tsvector DB
trigger; the queue was pure dead weight, growing forever (1902 stuck jobs in Redis,
the first real hit of the #355 queue-growing alert — which fired correctly).

Remove the plumbing:
- the 3 producers: drop @InjectQueue(SEARCH_QUEUE) + every searchQueue.add(...) from
  page/space/workspace.listener.ts (and the isTypesense() gate that only wrapped the
  search enqueue). page.listener.handlePageUpdated did ONLY the search enqueue, so its
  @OnEvent(PAGE_UPDATED) handler is removed; the other handlers keep their aiQueue.add.
- the registration (queue.module.ts) and the metrics injection + 'search' depth-metric
  entry (metrics-bull.service.ts).
- the constants: QueueName.SEARCH_QUEUE + the 6 unused SEARCH_INDEX_* QueueJob members
  (grep-confirmed unreferenced). Shared QueueJob members (PAGE_*, SPACE_DELETED,
  WORKSPACE_DELETED — used by the AI queue / embedding/history/notification processors)
  are kept.

Search (tsvector trigger, search.service) and the PAGE_UPDATED websocket listener are
untouched. Verified: apps/server tsc --noEmit 0 errors; 6 spec suites / 52 tests green.

Ops (maintainer, out of code scope): one-time Redis cleanup
`redis-cli --scan --pattern "bull:{search-queue}:*" | xargs -r redis-cli del`, then
confirm bullmq_queue_depth{queue="search"} stays 0 (the metric no longer injects it).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/server/src/integrations/queue/queue.module.ts

@@ -57,14 +57,6 @@ import { GeneralQueueProcessor } from './processors/general-queue.processor';
         attempts: 1,
       },
     }),
-    BullModule.registerQueue({
-      name: QueueName.SEARCH_QUEUE,
-      defaultJobOptions: {
-        removeOnComplete: true,
-        removeOnFail: true,
-        attempts: 2,
-      },
-    }),
     BullModule.registerQueue({
       name: QueueName.AI_QUEUE,
       defaultJobOptions: {