整理了初始化过程，现在更容易被继承了。

sync_state_machine/config/run_presets.py

@@ -1,7 +1,6 @@
 from __future__ import annotations
 
 import json
-import importlib
 from pathlib import Path
 from typing import Any, Dict, List, Tuple
 
@@ -29,43 +28,6 @@ def _replace_placeholders(value: Any, project_root: Path) -> Any:
     return value
 
 
-def _import_from_path(import_path: str) -> Any:
-    module_path, sep, attr_path = import_path.partition(":")
-    if not module_path:
-        raise ValueError(f"Invalid import path: {import_path}")
-
-    module = importlib.import_module(module_path)
-    if not sep:
-        return module
-
-    obj: Any = module
-    for attr_name in attr_path.split("."):
-        obj = getattr(obj, attr_name)
-    return obj
-
-
-def _apply_datasource_bootstraps(payload: Dict[str, Any]) -> Dict[str, Any]:
-    extensions = payload.pop("extensions", None)
-    if extensions is None:
-        return payload
-    if not isinstance(extensions, dict):
-        raise ValueError("extensions must be an object mapping")
-
-    bootstrap_paths = extensions.get("datasource_bootstraps") or []
-    if not isinstance(bootstrap_paths, list):
-        raise ValueError("extensions.datasource_bootstraps must be a list")
-
-    for item in bootstrap_paths:
-        if not isinstance(item, str) or not item.strip():
-            raise ValueError("extensions.datasource_bootstraps entries must be non-empty strings")
-        loaded = _import_from_path(item)
-        if not callable(loaded):
-            raise TypeError(f"datasource bootstrap must resolve to a callable: {item}")
-        loaded()
-
-    return payload
-
-
 def list_preset_names() -> List[str]:
     return sorted(PRESET_FILES.keys())
 
@@ -115,7 +77,8 @@ def load_overrides_from_file(file_path: Path, project_root: Path) -> Dict[str, A
     resolved = _replace_placeholders(payload, project_root)
     if not isinstance(resolved, dict):
         raise ValueError(f"Preset file must contain object mapping: {file_path}")
-    return _apply_datasource_bootstraps(resolved)
+    resolved.pop("extensions", None)
+    return resolved
 
 
 def load_named_preset_overrides(project_root: Path, preset_name: str) -> Tuple[Dict[str, Any], Path, bool]: