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/app_factory.py

@@ -0,0 +1,44 @@
+import logging
+import os
+from logging.handlers import RotatingFileHandler
+
+from flask import Flask
+
+from backend.config import FRONTEND_DIST, LOG_DIR, PORT, SECRET_KEY_PATH, STATIC_DIR
+from backend.routes.api import api_bp
+from backend.routes.spa import spa_bp
+
+os.makedirs(LOG_DIR, exist_ok=True)
+os.makedirs(STATIC_DIR, exist_ok=True)
+
+
+def _load_secret_key():
+    secret = os.environ.get("SECRET_KEY")
+    if not secret and os.path.exists(SECRET_KEY_PATH):
+        with open(SECRET_KEY_PATH, "rb") as f:
+            secret = f.read()
+    if not secret:
+        secret = os.urandom(24)
+        with open(SECRET_KEY_PATH, "wb") as f:
+            f.write(secret)
+    return secret
+
+
+def create_app():
+    app = Flask(__name__)
+    app.secret_key = _load_secret_key()
+
+    handler = RotatingFileHandler(
+        os.path.join(LOG_DIR, "app.log"),
+        maxBytes=1024 * 1024 * 10,
+        backupCount=5,
+        encoding="utf-8",
+    )
+    handler.setLevel(logging.INFO)
+    handler.setFormatter(logging.Formatter("%(asctime)s - %(levelname)s - %(message)s"))
+    app.logger.addHandler(handler)
+    app.logger.setLevel(logging.INFO)
+
+    app.register_blueprint(api_bp)
+    app.register_blueprint(spa_bp)
+    return app