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/product.py

@@ -1,10 +1,21 @@
-from fastapi import APIRouter, Depends, HTTPException, Query
+from fastapi import APIRouter, Depends, HTTPException, Query, Response, UploadFile, File
 from sqlalchemy.ext.asyncio import AsyncSession
-from typing import Optional
+from typing import Optional, List
 from app.database import get_db
 from app.services.product import ProductService
+from app.services import export
 from app.api.v1.deps import get_current_user_id
 from pydantic import BaseModel
+import io
+import logging
+
+logger = logging.getLogger(__name__)
+
+try:
+    import openpyxl
+    HAS_OPENPYXL = True
+except ImportError:
+    HAS_OPENPYXL = False
 
 router = APIRouter()
 
@@ -50,6 +61,101 @@ async def list_products(
     return await service.list_products(user_id, category, page, size)
 
 
+@router.get("/export/csv")
+async def export_products(
+    user_id: str = Depends(get_current_user_id),
+    db: AsyncSession = Depends(get_db),
+):
+    service = ProductService(db)
+    result = await service.list_products(user_id, None, 1, 9999)
+    items = result.get("items", [])
+    csv_bytes = export.export_products_csv(items)
+    return Response(
+        content=csv_bytes,
+        media_type="text/csv",
+        headers={"Content-Disposition": "attachment; filename=products.csv"},
+    )
+
+
+@router.get("/export/xlsx")
+async def export_products_xlsx(
+    user_id: str = Depends(get_current_user_id),
+    db: AsyncSession = Depends(get_db),
+):
+    service = ProductService(db)
+    result = await service.list_products(user_id, None, 1, 9999)
+    items = result.get("items", [])
+    xlsx_bytes = export.export_products_xlsx(items)
+    return Response(
+        content=xlsx_bytes,
+        media_type="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
+        headers={"Content-Disposition": "attachment; filename=products.xlsx"},
+    )
+
+
+@router.post("/import")
+async def import_products(
+    file: UploadFile = File(...),
+    user_id: str = Depends(get_current_user_id),
+    db: AsyncSession = Depends(get_db),
+):
+    service = ProductService(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
+            records.append({
+                "name": str(row[0] or ""),
+                "name_en": str(row[1] or ""),
+                "category": str(row[2] or ""),
+                "description": str(row[3] or ""),
+                "price": str(row[4] or ""),
+                "price_unit": str(row[5] or "USD") if len(row) > 5 else "USD",
+                "moq": str(row[6] or "") if len(row) > 6 else "",
+                "keywords": [k.strip() for k in str(row[7] or "").split(",") if k.strip()] if len(row) > 7 else [],
+            })
+    elif filename.endswith(".csv"):
+        import csv
+        reader = csv.DictReader(io.StringIO(content.decode("utf-8-sig")))
+        records = []
+        for row in reader:
+            name = row.get("名称", row.get("name", "")).strip()
+            if not name:
+                continue
+            records.append({
+                "name": name,
+                "name_en": row.get("英文名", row.get("name_en", "")),
+                "category": row.get("分类", row.get("category", "")),
+                "description": row.get("描述", row.get("description", "")),
+                "price": row.get("价格", row.get("price", "")),
+                "price_unit": row.get("货币", row.get("price_unit", "USD")),
+                "moq": row.get("MOQ", row.get("moq", "")),
+                "keywords": [k.strip() for k in row.get("关键词", row.get("keywords", "")).split(",") if k.strip()],
+            })
+    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_product(user_id, rec)
+            imported += 1
+        except Exception as e:
+            errors.append(f"{rec.get('name', '')}: {str(e)}")
+
+    return {"imported": imported, "errors": errors}
+
+
 @router.get("/{product_id}")
 async def get_product(
     product_id: str,