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/common/helpers/utils.ts

@@ -76,6 +76,10 @@ export function sanitizeFileName(fileName: string): string {
   return sanitizedFilename.slice(0, 255);
 }
 
+export function removeAccent(str: string): string {
+  if (!str) return str;
+  return str.normalize('NFD').replace(/[\u0300-\u036f]/g, '');
+
 export function extractBearerTokenFromHeader(
   request: FastifyRequest,
 ): string | undefined {