feat: persist feature research and versioned alpha assessments

backend/app/research/workspace_contracts.py

@@ -75,6 +75,10 @@ class FeatureSpec(Contract):
     template: TemplateSpec | None = None
 
 
+class FeatureConversion(Contract):
+    version: int = Field(ge=1)
+
+
 class ViewSpec(Contract):
     name: str = Field(min_length=1, max_length=200)
     filters: dict = Field(default_factory=dict)
@@ -85,8 +89,7 @@ class ViewSpec(Contract):
     def valid_filters(cls, value):
         from ..schemas import AlphaFilters
 
-        AlphaFilters.model_validate(value)
-        return value
+        return AlphaFilters.model_validate(value).model_dump(mode="json", exclude_none=True)
 
 
 class AssetWrite(Contract):
@@ -151,6 +154,8 @@ class EvaluateInput(Contract):
 
     @model_validator(mode="after")
     def target(self):
+        if self.alpha_id and self.experiment_id:
+            raise ValueError("实验评估应选择关联回测运行；Alpha 评估单独保存")
         if bool(self.alpha_id) == bool(self.backtest_run_id):
             raise ValueError("选择 Alpha 或回测运行之一")
         return self