重构douyin上传，增加douyin图文

修复douyin视频封面上传

utils/login_qrcode.py

@@ -0,0 +1,52 @@
+# -*- coding: utf-8 -*-
+from datetime import datetime
+import base64
+from pathlib import Path
+
+import cv2
+import segno
+
+
+def build_login_qrcode_path(account_file: str, suffix: str = "login_qrcode") -> Path:
+    account_path = Path(account_file)
+    timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
+    return account_path.with_name(f"{account_path.stem}_{suffix}_{timestamp}.png")
+
+
+def save_data_url_image(data_url: str, output_path: Path) -> Path:
+    if not data_url.startswith("data:image/"):
+        raise ValueError("二维码地址不是 data:image 格式")
+
+    header, encoded = data_url.split(",", 1)
+    if ";base64" not in header:
+        raise ValueError("二维码图片不是 base64 编码")
+
+    output_path.parent.mkdir(parents=True, exist_ok=True)
+    output_path.write_bytes(base64.b64decode(encoded))
+    return output_path
+
+
+def remove_qrcode_file(qrcode_path: Path | None) -> bool:
+    if qrcode_path and qrcode_path.exists():
+        qrcode_path.unlink()
+        return True
+    return False
+
+
+def decode_qrcode_from_path(qrcode_path: Path) -> str | None:
+    image = cv2.imread(str(qrcode_path))
+    if image is None:
+        return None
+
+    detector = cv2.QRCodeDetector()
+    qrcode_content, _, _ = detector.detectAndDecode(image)
+    return qrcode_content or None
+
+
+def print_terminal_qrcode(qrcode_content: str, qrcode_path: Path, app_name: str) -> None:
+    print()
+    print(f"请使用{app_name}扫描下方二维码登录：")
+    segno.make(qrcode_content, error='L', boost_error=False).terminal(compact=True, border=0)
+    print("在 Windows 下建议使用 Windows Terminal（支持 UTF-8，可完整显示二维码）")
+    print(f"否则请打开 {qrcode_path} 扫码")
+    print()