revert: Remove incorrect use_sqlite from BackgroundJobManager

BackgroundJobManager in repositories/background_jobs.py does not have
use_sqlite parameter - that's SyncJobManager in jobs/manager.py.
The commit e46528d incorrectly added these parameters, crashing the server.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: jsbattig

src/code_indexer/server/app.py

@@ -2552,13 +2552,9 @@ async def validation_exception_handler(
         db_path=db_path,
     )
     # Initialize BackgroundJobManager with persistence enabled (Story #541 - AC4)
-    # Story #702: Use SQLite backend for job storage
     jobs_storage_path = str(Path(server_data_dir) / "jobs.json")
     background_job_manager = BackgroundJobManager(
-        storage_path=jobs_storage_path,
-        resource_config=server_config.resource_config,
-        use_sqlite=True,
-        db_path=db_path,
+        storage_path=jobs_storage_path, resource_config=server_config.resource_config
     )
     # Inject BackgroundJobManager into GoldenRepoManager for async operations
     golden_repo_manager.background_job_manager = background_job_manager