feat: 管理后台完整可用 + 注册登录记日志 + 提取信息结构化展示 + 微信配置就绪

- 管理后台用户/统计/日志/配置四页签全部对接真实后端API
- auth注册/登录/游客/微信登录事件写入usage_logs表
- 提取信息结果从原始JSON改为卡片式字段列表（中文标签）
- 管理后台搜索按钮增加加载态和结果数提示
- 配置WECHAT_APP_ID/WECHAT_APP_SECRET
- 客户/产品/报价单CRUD页面完整（导出导入批量操作）

backend/app/api/v1/quotation.py

@@ -1,4 +1,4 @@
-from fastapi import APIRouter, Depends, HTTPException, Query, Response
+from fastapi import APIRouter, Depends, HTTPException, Query, Response, UploadFile, File
 from sqlalchemy.ext.asyncio import AsyncSession
 from typing import Optional
 from pydantic import BaseModel
@@ -10,6 +10,16 @@ from app.api.v1.deps import get_current_user_id
 from app.models.quotation import Quotation
 from app.models.customer import Customer
 from sqlalchemy import select, and_
+import logging
+import io
+
+logger = logging.getLogger(__name__)
+
+try:
+    import openpyxl
+    HAS_OPENPYXL = True
+except ImportError:
+    HAS_OPENPYXL = False
 
 router = APIRouter()
 
@@ -59,6 +69,64 @@ async def list_quotations(
     return await service.list_quotations(user_id, page, size)
 
 
+@router.post("/import")
+async def import_quotations(
+    file: UploadFile = File(...),
+    user_id: str = Depends(get_current_user_id),
+    db: AsyncSession = Depends(get_db),
+):
+    service = QuotationService(db)
+    content = await file.read()
+    filename = file.filename.lower()
+
+    if filename.endswith(".xlsx"):
+        if not HAS_OPENPYXL:
+            raise HTTPException(status_code=501, detail="openpyxl not installed, XLSX import unavailable")
+        wb = openpyxl.load_workbook(io.BytesIO(content))
+        ws = wb.active
+        rows = list(ws.iter_rows(min_row=2, values_only=True))
+        records = []
+        for row in rows:
+            if not row[0]:
+                continue
+            items = [{"product_name": "Imported Item", "quantity": 1, "unit_price": float(row[3]) if len(row) > 3 and row[3] else 0}]
+            records.append({
+                "title": str(row[0]),
+                "customer_id": str(row[1]) if len(row) > 1 and row[1] else "",
+                "currency": str(row[2]) if len(row) > 2 and row[2] in ("USD", "EUR", "GBP", "CNY") else "USD",
+                "items": items,
+                "status": "draft",
+            })
+    elif filename.endswith(".csv"):
+        import csv
+        reader = csv.DictReader(io.StringIO(content.decode("utf-8-sig")))
+        records = []
+        for row in reader:
+            title = row.get("Title", row.get("标题", "")).strip()
+            if not title:
+                continue
+            items = [{"product_name": "Imported Item", "quantity": 1, "unit_price": float(row.get("Total", row.get("总计", 0)))}]
+            records.append({
+                "title": title,
+                "customer_id": row.get("Customer", row.get("客户", "")),
+                "currency": row.get("Currency", row.get("货币", "USD")),
+                "items": items,
+            })
+    else:
+        raise HTTPException(status_code=400, detail="Unsupported file format. Use .xlsx or .csv")
+
+    imported = 0
+    errors = []
+    for rec in records:
+        try:
+            await service.create_quotation(user_id, rec)
+            imported += 1
+        except Exception as e:
+            errors.append(f"{rec.get('title', '')}: {str(e)}")
+
+    return {"imported": imported, "errors": errors}
+
+
 @router.get("/{quotation_id}")
 async def get_quotation(
     quotation_id: str,
@@ -102,6 +170,22 @@ async def export_quotations(
     )
 
 
+@router.get("/export/xlsx")
+async def export_quotations_xlsx(
+    user_id: str = Depends(get_current_user_id),
+    db: AsyncSession = Depends(get_db),
+):
+    service = QuotationService(db)
+    result = await service.list_quotations(user_id, 1, 9999)
+    items = result.get("items", [])
+    xlsx_bytes = export.export_quotations_xlsx(items)
+    return Response(
+        content=xlsx_bytes,
+        media_type="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
+        headers={"Content-Disposition": "attachment; filename=quotations.xlsx"},
+    )
+
+
 @router.get("/{quotation_id}/pdf")
 async def export_quotation_pdf(
     quotation_id: str,