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

docs/ARCHITECTURE.md

@@ -220,6 +220,10 @@ src/core/
 | `Serie`        | Domain entity with `sanitized_folder` property for filesystem-safe names   |
 | `SerieList`    | Collection management with automatic folder creation using sanitized names |
 
+**Initialization:**
+
+`SeriesApp` is initialized with `skip_load=True` passed to `SerieList`, preventing automatic loading of series from data files on every instantiation. Series data is loaded once during application setup via `sync_series_from_data_files()` in the FastAPI lifespan, which reads data files and syncs them to the database. Subsequent operations load series from the database through the service layer.
+
 Source: [src/core/](../src/core/)
 
 ### 2.4 Infrastructure Layer (`src/infrastructure/`)
@@ -576,10 +580,10 @@ Source: [src/server/services/auth_service.py](../src/server/services/auth_servic
 
 ### 9.2 Password Requirements
 
--   Minimum 8 characters
--   Mixed case (upper and lower)
--   At least one number
--   At least one special character
+- Minimum 8 characters
+- Mixed case (upper and lower)
+- At least one number
+- At least one special character
 
 Source: [src/server/services/auth_service.py](../src/server/services/auth_service.py#L97-L125)