Enhance backend startup logging and API endpoint display

- Updated `run.py` to conditionally print startup information only in the reloader process to avoid duplicate logs in debug mode.
- Modified `__init__.py` to log startup and completion messages based on the reloader process condition.
- Added warnings suppression in `graph_builder.py` for Pydantic v2 regarding Field usage.
- Revised `ontology_generator.py` to enforce strict design guidelines for entity types and relationships, ensuring compliance with new requirements.
- Improved logging behavior in `logger.py` to prevent log propagation to the root logger, avoiding duplicate outputs.

backend/app/utils/logger.py

@@ -31,6 +31,9 @@ def setup_logger(name: str = 'mirofish', level: int = logging.DEBUG) -> logging.
     logger = logging.getLogger(name)
     logger.setLevel(level)
     
+    # 阻止日志向上传播到根 logger，避免重复输出
+    logger.propagate = False
+    
     # 如果已经有处理器，不重复添加
     if logger.handlers:
         return logger