fix: 预算录入搜索不过滤 — plans API补keyword参数(KPI名称模糊搜索)

backend/app/api/budget.py

@@ -23,6 +23,7 @@ def list_budget_plans(
     period: Optional[str] = Query(None),
     year: Optional[int] = Query(None),
     version: Optional[str] = Query(None),
+    keyword: Optional[str] = Query(None, description="搜索KPI名称"),
     db: Session = Depends(get_db),
     entity_id: int = Depends(get_entity_id),
 ):
@@ -39,6 +40,8 @@ def list_budget_plans(
         query = query.filter(BudgetPlan.budget_year == year)
     if version:
         query = query.filter(BudgetPlan.version == version)
+    if keyword:
+        query = query.filter(KPIDefinition.kpi_name.contains(keyword))
 
     plans = query.order_by(BudgetPlan.budget_year.desc(), BudgetPlan.budget_month.asc()).all()