refactor: consolidate nfo modules into src/server/nfo/

Move nfo_models, tmdb_client, nfo_generator, nfo_mapper from
scattered temp directories into single src/server/nfo/ package.
Update all imports to reflect new structure.

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

tests/performance/test_nfo_batch_performance.py

@@ -297,7 +297,7 @@ class TestTMDBAPIBatchingOptimization:
             
             # Simulate rate limit on 5th call
             if call_count == 5:
-                from src.server.services_nfo_temp.tmdb_client import TMDBAPIError
+                from src.server.nfo.tmdb_client import TMDBAPIError
                 raise TMDBAPIError("Rate limit exceeded")
             
             await asyncio.sleep(0.01)