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/routers/calendar.py

@@ -0,0 +1,101 @@
+from datetime import datetime, timezone
+
+from fastapi import APIRouter, Depends, HTTPException
+
+from app.middleware.auth import get_current_user
+from app.models.checkup import CheckupPlan, CheckupItem
+from app.models.user import User
+
+router = APIRouter()
+
+# 标准产检计划
+STANDARD_CHECKUPS = [
+    CheckupItem(title="首次产检", week=6, items=["B超确认宫内孕", "血常规", "尿常规", "肝功能", "肾功能"], preparations=["空腹", "带身份证和医保卡"], notes="确认怀孕和预产期", importance="high"),
+    CheckupItem(title="NT检查", week=12, items=["NT超声筛查", "血清学筛查", "血压", "体重"], preparations=["不需要空腹", "需憋尿"], notes="筛查唐氏综合征风险", importance="high"),
+    CheckupItem(title="唐氏筛查", week=16, items=["唐氏筛查抽血", "血压", "体重", "宫高腹围"], preparations=["空腹抽血"], notes="评估胎儿染色体异常风险", importance="high"),
+    CheckupItem(title="大排畸检查", week=22, items=["四维彩超", "血压", "体重", "宫高腹围"], preparations=["不需要空腹", "提前预约"], notes="全面筛查胎儿结构畸形", importance="high"),
+    CheckupItem(title="糖耐量检查", week=24, items=["OGTT糖耐量试验", "血压", "体重"], preparations=["空腹8-14小时", "检查前3天正常饮食"], notes="筛查妊娠期糖尿病", importance="high"),
+    CheckupItem(title="常规产检", week=28, items=["血常规", "尿常规", "血压", "体重", "胎心监护"], preparations=["空腹"], notes="进入孕晚期，增加产检频率", importance="medium"),
+    CheckupItem(title="常规产检", week=30, items=["B超评估胎儿发育", "血压", "体重", "胎心监护"], preparations=[], notes="评估胎儿生长发育", importance="medium"),
+    CheckupItem(title="常规产检", week=32, items=["血常规", "尿常规", "血压", "体重", "胎心监护", "B超"], preparations=["空腹"], notes="观察胎位", importance="medium"),
+    CheckupItem(title="GBS筛查", week=36, items=["B族链球菌筛查", "血压", "体重", "胎心监护", "内检"], preparations=[], notes="预防新生儿感染", importance="high"),
+    CheckupItem(title="每周产检", week=37, items=["胎心监护", "血压", "体重", "宫高腹围"], preparations=[], notes="每周一次，准备待产", importance="medium"),
+    CheckupItem(title="每周产检", week=38, items=["胎心监护", "B超评估", "血压", "体重"], preparations=[], notes="评估分娩时机", importance="medium"),
+    CheckupItem(title="每周产检", week=39, items=["胎心监护", "血压", "体重", "宫颈评估"], preparations=[], notes="关注产兆", importance="high"),
+    CheckupItem(title="预产期产检", week=40, items=["胎心监护", "B超", "血压", "体重", "催产评估"], preparations=[], notes="超过预产期需密切监护", importance="high"),
+]
+
+
+@router.get("/plan")
+async def get_checkup_plan(user: User = Depends(get_current_user)):
+    """获取产检计划"""
+    plan = await CheckupPlan.find_one(CheckupPlan.user_id == user.id)
+
+    if not plan:
+        # Generate default plan
+        plan = CheckupPlan(user_id=user.id, checkups=STANDARD_CHECKUPS)
+        await plan.insert()
+
+    # Mark completed checkups based on current week
+    current_week = user.pregnancy_week or 0
+    checkups = []
+    for c in plan.checkups:
+        status = c.status
+        if c.week < current_week and status == "upcoming":
+            status = "missed"
+        checkups.append({
+            **c.model_dump(),
+            "status": status,
+        })
+
+    # Find next checkup
+    next_checkup = None
+    for c in checkups:
+        if c["status"] == "upcoming":
+            next_checkup = c
+            break
+
+    return {
+        "checkups": checkups,
+        "next_checkup": next_checkup,
+        "current_week": current_week,
+    }
+
+
+@router.put("/plan/{week}/complete")
+async def complete_checkup(week: int, user: User = Depends(get_current_user)):
+    """标记产检已完成"""
+    plan = await CheckupPlan.find_one(CheckupPlan.user_id == user.id)
+    if not plan:
+        raise HTTPException(status_code=404, detail="产检计划不存在")
+
+    for checkup in plan.checkups:
+        if checkup.week == week:
+            checkup.status = "completed"
+            break
+
+    plan.updated_at = datetime.now(timezone.utc)
+    await plan.save()
+    return {"message": "已标记完成"}
+
+
+async def link_report_to_checkup(user_id, report_id: str, pregnancy_week: int):
+    """将报告自动关联到最近的产检（±2周窗口），并标记该产检为已完成"""
+    plan = await CheckupPlan.find_one(CheckupPlan.user_id == user_id)
+    if not plan:
+        return
+
+    best = None
+    best_diff = 999
+    for c in plan.checkups:
+        diff = abs(c.week - pregnancy_week)
+        if diff <= 2 and diff < best_diff:
+            best = c
+            best_diff = diff
+
+    if best:
+        if report_id not in best.report_ids:
+            best.report_ids.append(report_id)
+        best.status = "completed"
+        plan.updated_at = datetime.now(timezone.utc)
+        await plan.save()