fix: 个人微信二维码改为后端生成真正可扫的 PNG(前端 <img> 原渲染 HTML URL 失效)

backend/python/app/api/im_bot_user.py

@@ -249,9 +249,24 @@ async def wechat_qrcode(user: User = Depends(get_current_user)):
         if not resp.ok:
             return {"success": False, "error": f"获取二维码失败 HTTP {resp.status_code}"}
         j = resp.json() if resp.content else {}
+        qr_url = j.get("qrcode_img_content") or ""
+        qr_img = None
+        try:
+            import io as _io
+            import qrcode as _qrcode
+            _buf = _io.BytesIO()
+            _q = _qrcode.QRCode(box_size=10, border=2)
+            _q.add_data(qr_url)
+            _q.make(fit=True)
+            _img = _q.make_image(fill_color="black", back_color="white")
+            _img.save(_buf, format="PNG")
+            qr_img = "data:image/png;base64," + base64.b64encode(_buf.getvalue()).decode()
+        except Exception:
+            qr_img = None
         return {"success": True, "data": {
             "qrcode": j.get("qrcode"),
-            "qrcode_img_content": j.get("qrcode_img_content"),
+            "qrcode_img_content": qr_url,
+            "qrcode_img": qr_img,
         }}
     except Exception as e:
         raise HTTPException(status_code=500, detail=str(e))