feat: generate permission sql for stocktake modules and implement single-device login restriction

inventory-backend/app/extensions.py

@@ -3,6 +3,7 @@ from flask_migrate import Migrate
 from flask_cors import CORS
 from flask_jwt_extended import JWTManager  # 确保引入了 JWTManager
 from datetime import datetime, timezone, timedelta
+import redis
 
 # 1. 创建扩展实例（此时未绑定具体的 App）
 db = SQLAlchemy()
@@ -10,6 +11,9 @@ migrate = Migrate()
 cors = CORS()
 jwt = JWTManager()  # 必须实例化
 
+# Redis 客户端 (单设备登录互踢用)
+redis_client = None
+
 
 def beijing_time():
     """获取北京时间 (UTC+8)"""
@@ -21,6 +25,8 @@ def init_extensions(app):
     """
     统一初始化所有 Flask 扩展
     """
+    global redis_client
+
     # 初始化数据库
     db.init_app(app)
 
@@ -31,4 +37,13 @@ def init_extensions(app):
     cors.init_app(app, resources={r"/api/*": {"origins": "*"}})
 
     # 初始化 JWT (这一步至关重要，缺少它会导致 500 错误)
-    jwt.init_app(app)
+    jwt.init_app(app)
+
+    # 初始化 Redis (单设备登录互踢)
+    redis_url = app.config.get('REDIS_URL', 'redis://localhost:6379/0')
+    try:
+        redis_client = redis.from_url(redis_url, decode_responses=True)
+        redis_client.ping()
+        app.logger.info("✅ Redis connected successfully")
+    except Exception as e:
+        app.logger.warning(f"⚠️ Redis connection failed: {e}, single-device login will be disabled")