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>

scripts/test_qr_api3.py

@@ -0,0 +1,66 @@
+import requests
+import time
+
+UA = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36"
+
+s = requests.Session()
+base_headers = {
+    "User-Agent": UA,
+    "Referer": "https://www.douyin.com/",
+    "Accept": "application/json, text/plain, */*",
+    "Origin": "https://www.douyin.com",
+}
+
+s.post(
+    "https://ttwid.bytedance.com/ttwid/union/register/",
+    json={
+        "region": "cn",
+        "aid": 1768,
+        "needFid": False,
+        "service": "www.douyin.com",
+        "migrate_info": {"ticket": "", "source": "web"},
+        "cbUrlProtocol": "https",
+        "union": True,
+    },
+    headers=base_headers,
+    timeout=15,
+)
+s.get("https://www.douyin.com/", headers=base_headers, timeout=15)
+s.get("https://www.douyin.com/passport/web/login/", headers=base_headers, timeout=15)
+
+csrf = None
+for c in s.cookies:
+    if c.name == "passport_csrf_token":
+        csrf = c.value
+        break
+print("passport_csrf_token", csrf)
+print("all cookies", [(c.name, c.domain) for c in s.cookies])
+
+ts = int(time.time() * 1000)
+params = {
+    "aid": "6383",
+    "service": "https://www.douyin.com",
+    "need_logo": "false",
+    "is_vcd": "1",
+    "t": str(ts),
+}
+headers = dict(base_headers)
+if csrf:
+    headers["x-tt-passport-csrf-token"] = csrf
+
+for method in ("GET", "POST"):
+    if method == "POST":
+        r = s.post(
+            "https://www.douyin.com/passport/web/get_qrcode/",
+            params=params,
+            headers=headers,
+            timeout=15,
+        )
+    else:
+        r = s.get(
+            "https://www.douyin.com/passport/web/get_qrcode/",
+            params=params,
+            headers=headers,
+            timeout=15,
+        )
+    print(method, r.status_code, r.text[:500])