添加search方法

backend/schemas.py

@@ -22,4 +22,10 @@ class CrawlResult(BaseModel):
 
 class SaveResultsRequest(BaseModel):
     task_id: int
-    results: List[CrawlResult]
+    results: List[CrawlResult]
+
+class SearchRequest(BaseModel):
+    # 如果不传 task_id，则进行全库搜索
+    task_id: Optional[int] = None
+    query_embedding: List[float]
+    limit: Optional[int] = 5