fix: 快递100 OCR面单识别接口改用 HTTPS

HTTP 请求返回 404 HTML 页面，改为 HTTPS 解决。

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/services/logistics_service.py

@@ -866,13 +866,14 @@ class LogisticsService:
                 }).encode("utf-8")
 
                 req = request.Request(
-                    url="http://api.kuaidi100.com/elec/detocr",
+                    url="https://api.kuaidi100.com/elec/detocr",
                     data=form_data,
                     headers={"Content-Type": "application/x-www-form-urlencoded"},
                     method="POST",
                 )
                 with request.urlopen(req, timeout=30) as resp:
-                    result = json.loads(resp.read().decode("utf-8") or "{}")
+                    raw = resp.read().decode("utf-8") or "{}"
+                    result = json.loads(raw)
 
                 raw_result = result
                 # 5. 解析返回: data.waybill 为运单号, data.barcode 为条码