Optimize startup: skip series loading on every SeriesApp init

- SeriesApp now passes skip_load=True to SerieList
- Prevents redundant data file loading on every startup
- Series loaded once during setup via sync_series_from_data_files()
- Removed obsolete _init_list_sync() and _init_list() methods
- Updated documentation in ARCHITECTURE.md and README.md

README.md

@@ -4,22 +4,22 @@ A web-based anime download manager with REST API, WebSocket real-time updates, a
 
 ## Features
 
--   Web interface for managing anime library
--   REST API for programmatic access
--   WebSocket real-time progress updates
--   Download queue with priority management
--   Automatic library scanning for missing episodes
--   **NFO metadata management with TMDB integration**
--   **Automatic poster/fanart/logo downloads**
--   JWT-based authentication
--   SQLite database for persistence
+- Web interface for managing anime library
+- REST API for programmatic access
+- WebSocket real-time progress updates
+- Download queue with priority management
+- Automatic library scanning for missing episodes
+- **NFO metadata management with TMDB integration**
+- **Automatic poster/fanart/logo downloads**
+- JWT-based authentication
+- SQLite database for persistence
 
 ## Quick Start
 
 ### Prerequisites
 
--   Python 3.10+
--   Conda (recommended) or virtualenv
+- Python 3.10+
+- Conda (recommended) or virtualenv
 
 ### Installation
 
@@ -144,12 +144,34 @@ conda run -n AniWorld python -m pytest tests/integration/ -v
 
 ## Technology Stack
 
--   **Web Framework**: FastAPI 0.104.1
--   **Database**: SQLite + SQLAlchemy 2.0
--   **Auth**: JWT (python-jose) + passlib
--   **Validation**: Pydantic 2.5
--   **Logging**: structlog
--   **Testing**: pytest + pytest-asyncio
+- **Web Framework**: FastAPI 0.104.1
+- **Database**: SQLite + SQLAlchemy 2.0
+- **Auth**: JWT (python-jose) + passlib
+- **Validation**: Pydantic 2.5
+- **Logging**: structlog
+- **Testing**: pytest + pytest-asyncio
+
+## Application Lifecycle
+
+### Initialization
+
+On first startup, the application performs a one-time sync of series from data files to the database:
+
+1. FastAPI lifespan starts
+2. Database is initialized
+3. `sync_series_from_data_files()` reads all data files from the anime directory
+4. Series metadata is synced to the database
+5. `SeriesApp` loads series from database (not from files)
+
+On subsequent startups, `SeriesApp` initializes with an empty series list (`skip_load=True`). Series are loaded from the database by the service layer as needed, avoiding redundant file system scans.
+
+### Adding New Series
+
+When adding a new series:
+
+1. Series is added to the database via `AnimeService`
+2. Data file is created in the anime directory
+3. In-memory `SerieList` is updated via `load_series_from_list()`
 
 ## License