chore(git-sync): drop now-unused dirname import (PR #119 review)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

apps/server/src/integrations/git-sync/services/git-sync.orchestrator.ts

@@ -6,7 +6,6 @@ import {
 } from '@nestjs/common';
 import { SchedulerRegistry } from '@nestjs/schedule';
 import { mkdir, readFile, rm, writeFile } from 'node:fs/promises';
-import { dirname } from 'node:path';
 import { InjectKysely } from 'nestjs-kysely';
 import { KyselyDB } from '@docmost/db/types/kysely.types';
 import { sql } from 'kysely';