v3接口restful风格，规范化接口；添加mcp服务器；新增log模块

backend/schemas/v3.py

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+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
+
+# --- [POST] 创建任务 ---
+class TaskCreateRequest(BaseModel):
+    url: str = Field(..., description="目标网站根URL", example="https://docs.firecrawl.dev")
+
+# --- [POST] 执行任务 ---
+class TaskExecuteRequest(BaseModel):
+    batch_size: int = Field(10, ge=1, le=50, description="并发线程数/批次大小")
+
+# --- [GET] 监控数据 ---
+class TaskStatusData(BaseModel):
+    root_url: str
+    stats: Dict[str, int] = Field(..., description="数据库统计: pending/processing/completed")
+    active_threads: List[str] = Field(..., description="内存实时: 当前正在爬取的URL列表")
+    active_thread_count: int
+
+# --- [POST] 搜索 ---
+class SearchRequest(BaseModel):
+    query: str
+    task_id: Optional[int] = None
+    return_num: int = Field(5, description="返回结果数量")
+
+class SearchResultItem(BaseModel):
+    task_id: int
+    source_url: str
+    title: Optional[str] = None
+    content: str
+    score: float
+    meta_info: Dict = {}
+    reranked: Optional[bool] = False