refactor : 清理工厂和配置系统中的死代码与冗余抽象

- 删除 Registry 中未使用的 category/priority 字段，_entries 简化为直接存储类引用
- 修正 __init_subclass__ 避免叶子类（AutoRegressiveLM 等）创建空注册表
- 删除 5 个工厂的薄 create() 覆写，统一使用 BaseFactory.create(name, *args, **kwargs)
- 删除 3 处零调用的 available_types/available_strategies 别名死代码
- 删除零调用的 BaseModelConfig.to_file 死代码
- 将 BaseConfig.from_json/to_json 重命名为 from_file/to_file，消除与子类重复
- 移除两个 inference builder 中总是被覆写的 prompt_tokens=0

astrai/factory.py

@@ -8,8 +8,6 @@ from typing import (
     Dict,
     ForwardRef,
     Generic,
-    Optional,
-    Tuple,
     Type,
     TypeVar,
 )
@@ -56,21 +54,19 @@ class BaseFactory(ABC, Generic[T]):
     unrelated parameters.
     """
 
-    _entries: Dict[str, Tuple[Type, Optional[str], int]]
+    _entries: Dict[str, Type[T]]
 
     def __init_subclass__(cls, **kwargs):
         super().__init_subclass__(**kwargs)
-        cls._entries = {}
         for orig_base in getattr(cls, "__orig_bases__", ()):
             if _get_origin(orig_base) is BaseFactory:
                 (arg,) = _get_args(orig_base)
+                cls._entries = {}
                 cls._component_base = _resolve_type(arg, cls)
                 return
 
     @classmethod
-    def register(
-        cls, name: str, category: Optional[str] = None, priority: int = 0
-    ) -> Callable[[Type[T]], Type[T]]:
+    def register(cls, name: str) -> Callable[[Type[T]], Type[T]]:
         """Decorator to register a component class.
 
         Validates that the decorated class inherits from the generic
@@ -81,7 +77,7 @@ class BaseFactory(ABC, Generic[T]):
             cls._validate_component(component_cls)
             if name in cls._entries:
                 raise ValueError(f"Component '{name}' is already registered")
-            cls._entries[name] = (component_cls, category, priority)
+            cls._entries[name] = component_cls
             return component_cls
 
         return decorator
@@ -96,7 +92,7 @@ class BaseFactory(ABC, Generic[T]):
             raise ValueError(
                 f"Unknown component: '{name}'. Supported types: {sorted(cls._entries)}"
             )
-        component_cls = entry[0]
+        component_cls = entry
         sig = inspect.signature(component_cls.__init__)
         has_var_kwargs = any(
             p.kind == inspect.Parameter.VAR_KEYWORD for p in sig.parameters.values()
@@ -130,7 +126,7 @@ class BaseFactory(ABC, Generic[T]):
             raise ValueError(
                 f"Unknown component: '{name}'. Supported types: {sorted(cls._entries)}"
             )
-        return entry[0]
+        return entry
 
     @classmethod
     def list_registered(cls) -> list: