refactor: restructure core→server, split large entity files into database module

- Move src/core/ → src/server/
- Split SerieList.py (531 lines) and series.py (414 lines) into src/server/database/
- Add database/models.py for SQLAlchemy models
- Update all test imports to reflect new structure
- Remove deprecated test files (test_serie_class.py, test_serie_folder_with_year.py)

src/server/services/anime_service.py

@@ -8,7 +8,7 @@ from typing import Optional
 
 import structlog
 
-from src.core.SeriesApp import SeriesApp
+from src.server.SeriesApp import SeriesApp
 from src.server.services.progress_service import (
     ProgressService,
     ProgressType,
@@ -942,47 +942,16 @@ class AnimeService:
         in-memory episodeDict, so downloaded episodes are not shown
         as missing.
         """
-        from src.core.entities.series import Serie
         from src.server.database.connection import get_db_session
         from src.server.database.service import AnimeSeriesService
-        
+
         async with get_db_session() as db:
             anime_series_list = await AnimeSeriesService.get_all(
                 db, with_episodes=True
             )
-            
-            # Convert to Serie objects
-            series_list = []
-            for anime_series in anime_series_list:
-                # Build episode_dict from episodes relationship
-                # Only include episodes that are NOT downloaded (is_downloaded=False)
-                # so the missing-episode list stays accurate
-                episode_dict: dict[int, list[int]] = {}
-                if anime_series.episodes:
-                    for episode in anime_series.episodes:
-                        # Skip downloaded episodes — they are not missing
-                        if episode.is_downloaded:
-                            continue
-                        season = episode.season
-                        if season not in episode_dict:
-                            episode_dict[season] = []
-                        episode_dict[season].append(episode.episode_number)
-                    # Sort episode numbers
-                    for season in episode_dict:
-                        episode_dict[season].sort()
-                
-                serie = Serie(
-                    key=anime_series.key,
-                    name=anime_series.name,
-                    site=anime_series.site,
-                    folder=anime_series.folder,
-                    episodeDict=episode_dict,
-                    year=anime_series.year
-                )
-                series_list.append(serie)
-            
-            # Load into SeriesApp
-            self._app.load_series_from_list(series_list)
+
+            # Load AnimeSeries objects directly into SeriesApp
+            self._app.load_series_from_list(anime_series_list)
 
     async def sync_episodes_to_db(self, series_key: str) -> int:
         """
@@ -1178,17 +1147,17 @@ class AnimeService:
 
     async def add_series_to_db(
         self,
-        serie,
+        anime,
         db
     ):
         """
         Add a series to the database if it doesn't already exist.
         
-        Uses serie.key for identification. Creates a new AnimeSeries
+        Uses anime.key for identification. Creates a new AnimeSeries
         record in the database if it doesn't already exist.
         
         Args:
-            serie: The Serie instance to add
+            anime: The AnimeSeries instance to add
             db: Database session for async operations
             
         Returns:
@@ -1197,41 +1166,40 @@ class AnimeService:
         from src.server.database.service import AnimeSeriesService, EpisodeService
 
         # Check if series already exists in DB
-        existing = await AnimeSeriesService.get_by_key(db, serie.key)
+        existing = await AnimeSeriesService.get_by_key(db, anime.key)
         if existing:
             logger.debug(
                 "Series already exists in database: %s (key=%s)",
-                serie.name,
-                serie.key
+                anime.name,
+                anime.key
             )
             return None
         
         # Create new series in database
         anime_series = await AnimeSeriesService.create(
             db=db,
-            key=serie.key,
-            name=serie.name,
-            site=serie.site,
-            folder=serie.folder,
-            year=serie.year if hasattr(serie, 'year') else None,
+            key=anime.key,
+            name=anime.name,
+            site=anime.site,
+            folder=anime.folder,
+            year=anime.year if hasattr(anime, 'year') else None,
         )
         
-        # Create Episode records for each episode in episodeDict
-        if serie.episodeDict:
-            for season, episode_numbers in serie.episodeDict.items():
-                for episode_number in episode_numbers:
-                    await EpisodeService.create(
-                        db=db,
-                        series_id=anime_series.id,
-                        season=season,
-                        episode_number=episode_number,
-                    )
+        # Create Episode records for each episode in episodes relationship
+        if anime.episodes:
+            for episode in anime.episodes:
+                await EpisodeService.create(
+                    db=db,
+                    series_id=anime_series.id,
+                    season=episode.season,
+                    episode_number=episode.episode_number,
+                )
         
         logger.info(
             "Added series to database: %s (key=%s, year=%s)",
-            serie.name,
-            serie.key,
-            serie.year if hasattr(serie, 'year') else None
+            anime.name,
+            anime.key,
+            anime.year if hasattr(anime, 'year') else None
         )
         
         return anime_series