fix: 修复多个关键问题

- 修复前端路由守卫：未登录时不显示提示，直接跳转登录页
- 修复API拦截器：401错误不显示提示，直接跳转
- 增强验证码显示：图片尺寸从120x40增加到200x80
- 增大验证码字体：从28号增加到48号
- 优化验证码字符：排除易混淆的0和1
- 减少干扰线：从5条减少到3条，添加背景色优化
- 增强登录API日志：添加详细的调试日志
- 增强验证码生成和验证日志
- 优化异常处理和错误追踪

影响文件：
- src/router/index.ts
- src/api/request.ts
- app/services/auth_service.py
- app/api/v1/auth.py
- app/schemas/user.py

测试状态：
- 前端构建通过
- 后端语法检查通过
- 验证码显示效果优化完成

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

app/models/file_management.py

@@ -0,0 +1,46 @@
+"""
+文件管理数据模型
+"""
+from datetime import datetime
+from sqlalchemy import Column, BigInteger, String, DateTime, Text, Index, Boolean, ForeignKey
+from sqlalchemy.orm import relationship
+from app.db.base import Base
+
+
+class UploadedFile(Base):
+    """上传文件表"""
+
+    __tablename__ = "uploaded_files"
+
+    id = Column(BigInteger, primary_key=True, index=True)
+    file_name = Column(String(255), nullable=False, comment="存储文件名(UUID)")
+    original_name = Column(String(255), nullable=False, index=True, comment="原始文件名")
+    file_path = Column(String(500), nullable=False, comment="文件存储路径")
+    file_size = Column(BigInteger, nullable=False, comment="文件大小(字节)")
+    file_type = Column(String(100), nullable=False, index=True, comment="文件类型(MIME)")
+    file_ext = Column(String(50), nullable=False, comment="文件扩展名")
+    uploader_id = Column(BigInteger, ForeignKey("users.id"), nullable=True, comment="上传人ID")
+    upload_time = Column(DateTime, default=datetime.utcnow, nullable=False, index=True, comment="上传时间")
+    thumbnail_path = Column(String(500), nullable=True, comment="缩略图路径")
+    share_code = Column(String(100), nullable=True, unique=True, index=True, comment="分享码")
+    share_expire_time = Column(DateTime, nullable=True, index=True, comment="分享过期时间")
+    download_count = Column(BigInteger, default=0, comment="下载次数")
+    is_deleted = Column(Boolean, default=False, nullable=False, comment="是否删除")
+    deleted_at = Column(DateTime, nullable=True, comment="删除时间")
+    deleted_by = Column(BigInteger, ForeignKey("users.id"), nullable=True, comment="删除人ID")
+    remark = Column(Text, nullable=True, comment="备注")
+    created_at = Column(DateTime, default=datetime.utcnow, nullable=False)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow, nullable=False)
+
+    # 关系
+    uploader = relationship("User", foreign_keys=[uploader_id])
+    deleter = relationship("User", foreign_keys=[deleted_by])
+
+    # 索引
+    __table_args__ = (
+        Index("idx_uploaded_files_uploader", "uploader_id"),
+        Index("idx_uploaded_files_deleted", "is_deleted"),
+    )
+
+    def __repr__(self):
+        return f"<UploadedFile(id={self.id}, original_name={self.original_name}, file_type={self.file_type})>"