智教助手平台：完整初始化

- 前端：Vue3 + TS + Element Plus，24 个页面路由（课件/组题/教案/动画/思维导图/作文批改/命题/课堂/资源/社区等）
- 后端：FastAPI + SQLAlchemy + SQLite，17 个路由模块，AI 服务层含降级模板
- AI：glm-5.x 推理模型已禁用思维链，确保输出真实内容
- 修复：ai_service 两处请求体注入 enable_thinking/thinking disabled
- 测试账号：13900999999 / test1234

backend/models/audit.py

@@ -0,0 +1,21 @@
+from sqlalchemy import Column, DateTime, ForeignKey, Integer, String, Text
+from sqlalchemy.sql import func
+
+from database import Base
+
+
+class AuditLog(Base):
+    """安全审计日志：记录登录、权限变更、内容发布、敏感操作等。"""
+    __tablename__ = "audit_logs"
+
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, nullable=True, index=True)
+    username = Column(String(100), default="")
+    action = Column(String(64), nullable=False, index=True)
+    target_type = Column(String(32), default="")
+    target_id = Column(String(64), default="")
+    detail = Column(Text, default="")
+    ip = Column(String(64), default="")
+    user_agent = Column(String(255), default="")
+    status = Column(String(16), default="success")  # success / failed / denied
+    created_at = Column(DateTime, server_default=func.now())