feat: 初始化孕育无忧全栈项目基础代码结构

完成项目初始搭建，包含后端FastAPI+MongoDB服务、前端React+Vite项目的完整基础结构，添加各类配置文件与依赖清单，涵盖核心业务初始框架。

backend/app/schemas/report.py

@@ -0,0 +1,44 @@
+from datetime import datetime
+from typing import Optional
+
+from pydantic import BaseModel
+
+
+class DataItemSchema(BaseModel):
+    name: str
+    value: str
+    unit: str = ""
+    reference_range: str = ""
+    status: str = "normal"
+    category: str = ""
+
+
+class ReportVerifyRequest(BaseModel):
+    """数据校对提交"""
+    data_items: list[DataItemSchema]
+    symptoms: Optional[list[str]] = None
+    notes: Optional[str] = None
+    report_type: Optional[str] = None
+
+
+class ReportResponse(BaseModel):
+    id: str
+    report_type: str
+    pregnancy_week: Optional[int]
+    image_urls: list[str]
+    data_items: list[DataItemSchema]
+    symptoms: Optional[list[str]]
+    notes: Optional[str]
+    status: str
+    overall_status: str
+    created_at: datetime
+
+
+class ReportListItem(BaseModel):
+    id: str
+    report_type: str
+    pregnancy_week: Optional[int]
+    overall_status: str
+    summary: str = ""
+    item_count: int = 0
+    created_at: datetime