重构为 HTTP SSO 扫码方案并引入 Vue3 前端

移除 Playwright 浏览器自动化，改用 passport/SSO HTTP 接口获取二维码与轮询登录；后端模块化拆分，前端替换为 Vue3 SPA。

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/cookies.py

@@ -0,0 +1,59 @@
+LOGIN_COOKIE_KEYS = frozenset({
+    "sessionid", "sessionid_ss", "sid_guard", "uid_tt", "uid_tt_ss",
+    "sso_uid_tt", "sso_uid_tt_ss", "passport_sso_user_id",
+    "sid_ucp_sso", "sid_guard_ee", "uid_tt_ee",
+    "passport_auth_status", "login_time", "multi_sids",
+    "is_login", "douyin_tt",
+})
+
+
+def match_login_cookies(cookie_names):
+    name_set = set(cookie_names)
+    return [k for k in LOGIN_COOKIE_KEYS if k in name_set]
+
+
+def is_logged_in(cookies, cookie_names):
+    matched = match_login_cookies(cookie_names)
+    name_set = set(cookie_names)
+    if len(matched) >= 2:
+        return True
+    has_session = bool(name_set & {"sessionid", "sessionid_ss", "sid_guard", "sid_tt"})
+    has_uid = bool(name_set & {"uid_tt", "uid_tt_ss", "passport_sso_user_id"})
+    if has_session and has_uid:
+        return True
+    if has_session and len(cookies) >= 30:
+        return True
+    for c in cookies:
+        if c["name"] == "passport_auth_status":
+            val = str(c.get("value", "")).lower()
+            if val in ("1", "true", "yes", "2") and has_session:
+                return True
+        if c["name"] == "login_time" and c.get("value"):
+            return True
+    return False
+
+
+def extract_nickname(cookies):
+    for c in cookies:
+        if c["name"] in ("passport_sso_user_name", "nickname", "user_name", "user_nickname"):
+            return c["value"]
+    for c in cookies:
+        if c["name"] == "uid_tt" and c.get("value"):
+            return f"用户{c['value'][:8]}"
+    return "用户"
+
+
+def cookies_to_json(cookie_jar) -> list[dict]:
+    """将 requests CookieJar 转为前端 JSON 列表"""
+    items = []
+    for c in cookie_jar:
+        items.append({
+            "name": c.name,
+            "value": c.value,
+            "domain": c.domain or ".douyin.com",
+            "path": c.path or "/",
+            "expires": c.expires,
+            "httpOnly": bool(getattr(c, "_rest", {}).get("HttpOnly") or False),
+            "secure": bool(c.secure),
+        })
+    return items