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/schemas/maintenance.py

@@ -0,0 +1,127 @@
+"""
+维修管理相关的Pydantic Schema
+"""
+from typing import Optional, List, Dict, Any
+from datetime import datetime, date
+from decimal import Decimal
+from pydantic import BaseModel, Field
+
+
+# ===== 维修记录Schema =====
+
+class MaintenanceRecordBase(BaseModel):
+    """维修记录基础Schema"""
+    asset_id: int = Field(..., gt=0, description="资产ID")
+    fault_description: str = Field(..., min_length=1, description="故障描述")
+    fault_type: Optional[str] = Field(None, description="故障类型(hardware/software/network/other)")
+    priority: str = Field(default="normal", description="优先级(low/normal/high/urgent)")
+    maintenance_type: Optional[str] = Field(None, description="维修类型(self_repair/vendor_repair/warranty)")
+    vendor_id: Optional[int] = Field(None, gt=0, description="维修供应商ID")
+    maintenance_cost: Optional[Decimal] = Field(None, ge=0, description="维修费用")
+    maintenance_result: Optional[str] = Field(None, description="维修结果描述")
+    replaced_parts: Optional[str] = Field(None, description="更换的配件")
+    images: Optional[str] = Field(None, description="维修图片URL（多个逗号分隔）")
+    remark: Optional[str] = Field(None, description="备注")
+
+
+class MaintenanceRecordCreate(MaintenanceRecordBase):
+    """创建维修记录Schema"""
+    pass
+
+
+class MaintenanceRecordUpdate(BaseModel):
+    """更新维修记录Schema"""
+    fault_description: Optional[str] = Field(None, min_length=1)
+    fault_type: Optional[str] = None
+    priority: Optional[str] = None
+    maintenance_type: Optional[str] = None
+    vendor_id: Optional[int] = Field(None, gt=0)
+    maintenance_cost: Optional[Decimal] = Field(None, ge=0)
+    maintenance_result: Optional[str] = None
+    replaced_parts: Optional[str] = None
+    images: Optional[str] = None
+    remark: Optional[str] = None
+
+
+class MaintenanceRecordStart(BaseModel):
+    """开始维修Schema"""
+    maintenance_type: str = Field(..., description="维修类型")
+    vendor_id: Optional[int] = Field(None, gt=0, description="维修供应商ID（vendor_repair时必填）")
+    remark: Optional[str] = Field(None, description="备注")
+
+
+class MaintenanceRecordComplete(BaseModel):
+    """完成维修Schema"""
+    maintenance_result: str = Field(..., description="维修结果描述")
+    maintenance_cost: Optional[Decimal] = Field(None, ge=0, description="维修费用")
+    replaced_parts: Optional[str] = Field(None, description="更换的配件")
+    images: Optional[str] = Field(None, description="维修图片URL")
+    asset_status: str = Field(default="in_stock", description="资产维修后状态(in_stock/in_use)")
+
+
+class MaintenanceRecordInDB(BaseModel):
+    """数据库中的维修记录Schema"""
+    id: int
+    record_code: str
+    asset_id: int
+    asset_code: str
+    fault_description: str
+    fault_type: Optional[str]
+    report_user_id: Optional[int]
+    report_time: datetime
+    priority: str
+    maintenance_type: Optional[str]
+    vendor_id: Optional[int]
+    maintenance_cost: Optional[Decimal]
+    start_time: Optional[datetime]
+    complete_time: Optional[datetime]
+    maintenance_user_id: Optional[int]
+    maintenance_result: Optional[str]
+    replaced_parts: Optional[str]
+    status: str
+    images: Optional[str]
+    remark: Optional[str]
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+class MaintenanceRecordResponse(MaintenanceRecordInDB):
+    """维修记录响应Schema"""
+    pass
+
+
+class MaintenanceRecordWithRelations(MaintenanceRecordResponse):
+    """带关联信息的维修记录响应Schema"""
+    asset: Optional[Dict[str, Any]] = None
+    vendor: Optional[Dict[str, Any]] = None
+    report_user: Optional[Dict[str, Any]] = None
+    maintenance_user: Optional[Dict[str, Any]] = None
+
+
+# ===== 查询参数Schema =====
+
+class MaintenanceRecordQueryParams(BaseModel):
+    """维修记录查询参数"""
+    asset_id: Optional[int] = Field(None, gt=0, description="资产ID")
+    status: Optional[str] = Field(None, description="状态")
+    fault_type: Optional[str] = Field(None, description="故障类型")
+    priority: Optional[str] = Field(None, description="优先级")
+    maintenance_type: Optional[str] = Field(None, description="维修类型")
+    keyword: Optional[str] = Field(None, description="搜索关键词")
+    page: int = Field(default=1, ge=1, description="页码")
+    page_size: int = Field(default=20, ge=1, le=100, description="每页数量")
+
+
+# ===== 统计Schema =====
+
+class MaintenanceStatistics(BaseModel):
+    """维修统计Schema"""
+    total: int = Field(..., description="总数")
+    pending: int = Field(..., description="待处理数")
+    in_progress: int = Field(..., description="维修中数")
+    completed: int = Field(..., description="已完成数")
+    cancelled: int = Field(..., description="已取消数")
+    total_cost: Decimal = Field(..., description="总维修费用")