refactor: remove temp/legacy code artifacts

- Delete src/server/core_utils_temp/: nfo_generator.py, nfo_mapper.py
- Delete src/server/services_nfo_temp/: tmdb_client.py
- Remove legacy_file_migration.py from services/
- Remove test_legacy_migration.py integration test

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/server/services/initialization_service.py

@@ -10,7 +10,6 @@ import structlog
 from src.config.settings import settings
 from src.server.database.service import AnimeSeriesService
 from src.server.services.anime_service import sync_legacy_series_to_db
-from src.server.services.legacy_file_migration import migrate_series_from_files_to_db
 
 logger = structlog.get_logger(__name__)
 
@@ -106,26 +105,6 @@ async def _mark_initial_scan_completed() -> None:
     )
 
 
-async def _check_legacy_migration_status() -> bool:
-    """Check if legacy key/data file migration has been completed.
-
-    Returns:
-        bool: True if migration was completed, False otherwise
-    """
-    return await _check_scan_status(
-        check_method=lambda svc, db: svc.is_migration_legacy_files_completed(db),
-        scan_type="legacy_migration",
-        log_completed_msg="Legacy file migration already completed, skipping",
-        log_not_completed_msg="Legacy file migration not yet run, will check for files"
-    )
-
-
-async def _mark_legacy_migration_completed() -> None:
-    """Mark the legacy file migration as completed in system settings."""
-    await _mark_scan_completed(
-        mark_method=lambda svc, db: svc.mark_migration_legacy_files_completed(db),
-        scan_type="legacy_migration"
-    )
 
 
 async def _check_legacy_key_cleanup_status() -> bool:
@@ -150,33 +129,6 @@ async def _mark_legacy_key_cleanup_completed() -> None:
     )
 
 
-async def _migrate_legacy_files() -> int:
-    """Migrate series from legacy key/data files to database.
-
-    Returns:
-        int: Number of series migrated
-    """
-    from src.server.database.connection import get_db_session
-
-    logger.info("Checking for legacy key/data files to migrate...")
-
-    try:
-        async with get_db_session() as db:
-            migrated_count = await migrate_series_from_files_to_db(
-                settings.anime_directory,
-                db
-            )
-
-        if migrated_count > 0:
-            logger.info("Migrated %d series from legacy files", migrated_count)
-        else:
-            logger.info("No series found in legacy files to migrate")
-
-        return migrated_count
-
-    except Exception as e:
-        logger.warning("Failed to migrate legacy files: %s", e)
-        return 0
 
 
 async def _cleanup_legacy_key_files() -> int:
@@ -487,12 +439,6 @@ async def perform_initial_setup(progress_service=None):
         if folder_scan_count > 0:
             logger.info("Created %d series from anime folders", folder_scan_count)
 
-        # First, run legacy file migration if needed (independent of initial scan)
-        is_legacy_migration_done = await _check_legacy_migration_status()
-        if not is_legacy_migration_done:
-            await _migrate_legacy_files()
-            await _mark_legacy_migration_completed()
-
         # Sync series from anime folders to database
         await _sync_anime_folders(progress_service)