🕵️ refactor: Optimize Message Search Performance (#9818)

* 🕵️ feat: Enhance Index Sync and MeiliSearch filtering for User Field

- Implemented `ensureFilterableAttributes` function to configure MeiliSearch indexes for messages and conversations to filter by user.
- Updated sync logic to trigger a full re-sync if the user field is missing or index settings are modified.
- Adjusted search queries in Conversation and Message models to include user filtering.
- Ensured 'user' field is marked as filterable in MongoDB schema for both messages and conversations.

This update improves data integrity and search capabilities by ensuring user-related data is properly indexed and retrievable.

* fix: message processing in Search component to use linear list and not tree

* feat: Implement user filtering in MeiliSearch for shared links

* refactor: Optimize message search retrieval by batching database calls

* chore: Update MeiliSearch parameters type to use SearchParams for improved type safety

client/src/routes/Search.tsx

@@ -1,6 +1,5 @@
 import { useEffect, useMemo } from 'react';
 import { useRecoilValue } from 'recoil';
-import { buildTree } from 'librechat-data-provider';
 import { Spinner, useToastContext } from '@librechat/client';
 import MinimalMessagesWrapper from '~/components/Chat/Messages/MinimalMessages';
 import { useNavScrolling, useLocalize, useAuthContext } from '~/hooks';
@@ -43,9 +42,20 @@ export default function Search() {
   });
 
   const messages = useMemo(() => {
-    const msgs = searchMessages?.pages.flatMap((page) => page.messages) || [];
-    const dataTree = buildTree({ messages: msgs, fileMap });
-    return dataTree?.length === 0 ? null : (dataTree ?? null);
+    const msgs =
+      searchMessages?.pages.flatMap((page) =>
+        page.messages.map((message) => {
+          if (!message.files || !fileMap) {
+            return message;
+          }
+          return {
+            ...message,
+            files: message.files.map((file) => fileMap[file.file_id ?? ''] ?? file),
+          };
+        }),
+      ) || [];
+
+    return msgs.length === 0 ? null : msgs;
   }, [fileMap, searchMessages?.pages]);
 
   useEffect(() => {