feat: add unaccent support for accent-insensitive search (#1402)

- Add PostgreSQL unaccent and pg_trgm extensions
- Create immutable f_unaccent wrapper function for performance
- Update all search queries to use f_unaccent for accent-insensitive matching
- Add 1MB limit to tsvector content to prevent errors on large documents
- Update full-text search trigger to use f_unaccent
- Fix MultiSelect client-side filtering to show server results properly

apps/server/src/database/repos/group/group-user.repo.ts

@@ -6,6 +6,7 @@ import {
 import { InjectKysely } from 'nestjs-kysely';
 import { KyselyDB, KyselyTransaction } from '@docmost/db/types/kysely.types';
 import { dbOrTx, executeTx } from '@docmost/db/utils';
+import { sql } from 'kysely';
 import { GroupUser, InsertableGroupUser } from '@docmost/db/types/entity.types';
 import { PaginationOptions } from '../../pagination/pagination-options';
 import { executeWithPagination } from '@docmost/db/pagination/pagination';
@@ -56,7 +57,7 @@ export class GroupUserRepo {
 
     if (pagination.query) {
       query = query.where((eb) =>
-        eb('users.name', 'ilike', `%${pagination.query}%`),
+        eb(sql`f_unaccent(users.name)`, 'ilike', sql`f_unaccent(${'%' + pagination.query + '%'})`),
       );
     }