fix(research): remove template scope constraints and migrate stored templates

backend/app/research/experiments.py

@@ -138,8 +138,6 @@ class Experiments:
         asset = await self.assets.get(body.asset_id, body.version, "template") if body.asset_id else None
         template = TemplateSpec.model_validate(asset["content"]) if asset else body.template
         scope = scope_of(body.settings)
-        if template.scope and template.scope.model_dump() != scope:
-            raise HTTPException(422, "模板适用范围与候选设置不同")
         snapshots, fields = await self.inputs(body.input_ids, scope)
         parents = (
             parent_snapshots

backend/app/research/workspace_contracts.py

@@ -45,7 +45,6 @@ class TemplateSpec(Contract):
     description: str = Field(default="", max_length=10000)
     expression: str = Field(min_length=1, max_length=20000)
     variables: dict[str, Variable] = Field(default_factory=dict, max_length=100)
-    scope: Scope | None = None
     category: Literal["template", "fragment"] = "template"
 
     @field_validator("expression")