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/config/base.py

@@ -89,10 +89,10 @@ class BaseConfig:
         raise TypeError
 
     @classmethod
-    def from_json(cls, path: Union[str, Path]) -> Self:
+    def from_file(cls, path: Union[str, Path]) -> Self:
         with open(path, "r", encoding="utf-8") as f:
             return cls.from_dict(json.load(f))
 
-    def to_json(self, path: Union[str, Path]):
+    def to_file(self, path: Union[str, Path]):
         with open(path, "w", encoding="utf-8") as f:
             json.dump(self.to_dict(), f, indent=2, ensure_ascii=False)

astrai/config/model_config.py

@@ -1,6 +1,5 @@
-import json
 from dataclasses import dataclass
-from typing import Any, Dict, Optional, Self
+from typing import Any, Dict, Optional
 
 from astrai.config.base import BaseConfig
 from astrai.factory import BaseFactory
@@ -22,18 +21,6 @@ class BaseModelConfig(BaseConfig):
 
     model_type: Optional[str] = None
 
-    @classmethod
-    def from_file(cls, config_path: str) -> Self:
-        with open(config_path, "r") as f:
-            raw: Dict[str, Any] = json.load(f)
-        return cls.from_dict(raw)
-
-    def to_file(self, config_path: str):
-        d = self.to_dict()
-        config_dict = {k: v for k, v in d.items() if v is not None}
-        with open(config_path, "w") as f:
-            json.dump(config_dict, f, indent=4)
-
 
 @dataclass
 @ConfigFactory.register("autoregressive_lm")