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/brand_supplier.py

@@ -0,0 +1,70 @@
+"""
+品牌和供应商数据模型
+"""
+from datetime import datetime
+from sqlalchemy import Column, BigInteger, String, Integer, Text, ForeignKey, DateTime
+from sqlalchemy.orm import relationship
+from app.db.base import Base
+
+
+class Brand(Base):
+    """品牌表"""
+
+    __tablename__ = "brands"
+
+    id = Column(BigInteger, primary_key=True, index=True)
+    brand_code = Column(String(50), unique=True, nullable=False, index=True, comment="品牌代码")
+    brand_name = Column(String(200), nullable=False, comment="品牌名称")
+    logo_url = Column(String(500), nullable=True, comment="Logo URL")
+    website = Column(String(500), nullable=True, comment="官网地址")
+    status = Column(String(20), default="active", nullable=False, comment="状态: active, inactive")
+    sort_order = Column(Integer, default=0, nullable=False, comment="排序")
+    created_at = Column(DateTime, default=datetime.utcnow, nullable=False)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow, nullable=False)
+    created_by = Column(BigInteger, ForeignKey("users.id"), nullable=True)
+    updated_by = Column(BigInteger, ForeignKey("users.id"), nullable=True)
+    deleted_at = Column(DateTime, nullable=True)
+    deleted_by = Column(BigInteger, ForeignKey("users.id"), nullable=True)
+
+    # 关系
+    created_user = relationship("User", foreign_keys=[created_by])
+    updated_user = relationship("User", foreign_keys=[updated_by])
+    deleted_user = relationship("User", foreign_keys=[deleted_by])
+    assets = relationship("Asset", back_populates="brand")
+
+    def __repr__(self):
+        return f"<Brand(id={self.id}, brand_code={self.brand_code}, brand_name={self.brand_name})>"
+
+
+class Supplier(Base):
+    """供应商表"""
+
+    __tablename__ = "suppliers"
+
+    id = Column(BigInteger, primary_key=True, index=True)
+    supplier_code = Column(String(50), unique=True, nullable=False, index=True, comment="供应商代码")
+    supplier_name = Column(String(200), nullable=False, comment="供应商名称")
+    contact_person = Column(String(100), nullable=True, comment="联系人")
+    contact_phone = Column(String(20), nullable=True, comment="联系电话")
+    email = Column(String(255), nullable=True, comment="邮箱")
+    address = Column(String(500), nullable=True, comment="地址")
+    credit_code = Column(String(50), nullable=True, comment="统一社会信用代码")
+    bank_name = Column(String(200), nullable=True, comment="开户银行")
+    bank_account = Column(String(100), nullable=True, comment="银行账号")
+    status = Column(String(20), default="active", nullable=False, comment="状态: active, inactive")
+    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)
+    created_by = Column(BigInteger, ForeignKey("users.id"), nullable=True)
+    updated_by = Column(BigInteger, ForeignKey("users.id"), nullable=True)
+    deleted_at = Column(DateTime, nullable=True)
+    deleted_by = Column(BigInteger, ForeignKey("users.id"), nullable=True)
+
+    # 关系
+    created_user = relationship("User", foreign_keys=[created_by])
+    updated_user = relationship("User", foreign_keys=[updated_by])
+    deleted_user = relationship("User", foreign_keys=[deleted_by])
+    assets = relationship("Asset", back_populates="supplier")
+
+    def __repr__(self):
+        return f"<Supplier(id={self.id}, supplier_code={self.supplier_code}, supplier_name={self.supplier_name})>"