新增获取全部知识库的接口，api版本号重归到v1

backend/schemas/v1.py

@@ -0,0 +1,43 @@
+from pydantic import BaseModel, Field
+from typing import List, Optional, Dict, Any
+
+# --- 通用响应 ---
+class ResponseBase(BaseModel):
+    code: int = Field(..., description="1: 成功, 0: 失败")
+    msg: str
+    data: Optional[Any] = None
+
+# --- [GET] 知识库列表 (新功能) ---
+class KnowledgeBaseItem(BaseModel):
+    task_id: int
+    root_url: str
+    name: str  # 提取出的简短名称，方便 LLM 识别
+
+class KnowledgeBaseListResponse(BaseModel):
+    total: int
+    list: List[KnowledgeBaseItem]
+
+# --- [POST] 创建任务 ---
+class TaskCreateRequest(BaseModel):
+    url: str = Field(..., description="目标网站根URL")
+
+# --- [POST] 执行任务 ---
+class TaskExecuteRequest(BaseModel):
+    batch_size: int = Field(10, le=50)
+
+# --- [POST] 搜索 ---
+class SearchRequest(BaseModel):
+    query: str
+    # 明确支持 None 为全局搜索
+    task_id: Optional[int] = Field(None, description="任务ID，不传则搜全库")
+    limit: int = Field(5, description="返回数量")
+
+# ... (SearchResultItem 等保持不变) ...
+class SearchResultItem(BaseModel):
+    task_id: int
+    source_url: str
+    title: Optional[str] = None
+    content: str
+    score: float
+    meta_info: Dict = {}
+    reranked: Optional[bool] = False