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>

src/server/nfo/__init__.py

@@ -0,0 +1,9 @@
+"""NFO package - TV show metadata generation for Kodi/XBMC.
+
+Re-exports the public API for the nfo package.
+"""
+
+from src.server.nfo.nfo_models import TVShowNFO
+from src.server.nfo.tmdb_client import TMDBClient, TMDBAPIError
+from src.server.nfo.nfo_generator import generate_tvshow_nfo
+from src.server.nfo.nfo_mapper import tmdb_to_nfo_model