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/models/report.py

@@ -0,0 +1,50 @@
+from datetime import datetime, timezone
+from typing import Optional
+
+from beanie import Document, PydanticObjectId
+from pydantic import BaseModel, Field
+
+
+class DataItem(BaseModel):
+    """单个检查指标"""
+    name: str
+    value: str
+    unit: str = ""
+    reference_range: str = ""
+    status: str = "normal"  # normal / high / low
+    category: str = ""  # 血液检查 / 激素水平 / 尿常规 etc.
+
+
+class Report(Document):
+    user_id: PydanticObjectId
+    report_type: str = ""  # 血常规 / B超 / 尿常规 etc.
+    pregnancy_week: Optional[int] = None
+    report_date: Optional[str] = None  # 报告日期 YYYY-MM-DD
+
+    # Images
+    image_urls: list[str] = Field(default_factory=list)
+
+    # OCR results
+    ocr_raw_text: Optional[str] = None
+    data_items: list[DataItem] = Field(default_factory=list)
+
+    # User additions
+    symptoms: Optional[list[str]] = None  # 自觉症状
+    notes: Optional[str] = None  # 备注
+
+    # Privacy fields (auto-masked)
+    patient_name: Optional[str] = None
+    patient_id_masked: Optional[str] = None
+
+    # Status
+    status: str = "pending"  # pending / verified / analyzed
+    overall_status: str = "normal"  # normal / attention / warning
+
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+
+    class Settings:
+        name = "reports"
+        indexes = [
+            "user_id",
+        ]