feat: 完善前后端核心功能模块

后端:
- 新增认证(auth)、任务(tasks)、映射(mappings)、对账(reconciliation)、异常(exceptions)、导出(exports) API
- 新增核心模块: database, security, permissions, tenant, exceptions, error_handlers
- 新增数据模型: user, company, reconciliation_task, field_mapping, uploaded_file 等
- 新增服务层: ai_recognizer, file_parser, file_storage, mapping, reconciliation 等
- 添加数据库迁移脚本

前端:
- 新增登录页面和仪表盘页面
- 新增任务列表、任务详情、字段映射页面
- 新增异常处理页面和规则设置页面
- 新增 API 代理路由 /api/[...path]
- 新增 UI 组件库 (button, card, dialog, input, table 等)
- 新增 auth 组件 (ProtectedRoute, PermissionGate)
- 新增 layout 组件 (Header, Sidebar)
- 新增 mapping 组件 (FieldMappingTable, AISuggestionPanel)
- 新增 API 客户端和 hooks (useAsync, useToast, usePermission 等)
- 新增状态管理 (auth-store, company-store, ui-store)
- 集成 Tailwind CSS 和 shadcn/ui 组件库

其他:
- 添加 Alembic 数据库迁移配置
- 添加初始化示例数据脚本
- 更新项目文档

backend/app/schemas/mapping.py

@@ -0,0 +1,147 @@
+"""
+字段映射相关 Pydantic Schema
+"""
+
+from datetime import datetime
+from typing import List, Optional, Dict, Any
+
+from pydantic import BaseModel, Field
+
+
+# ===== 字段映射 Schema =====
+
+class FieldMappingBase(BaseModel):
+    """字段映射基础 schema"""
+    source_field: str = Field(..., description="源字段名")
+    standard_field: str = Field(..., description="标准字段名")
+    confidence: float = Field(..., ge=0, le=1, description="置信度 0-1")
+    reasoning: Optional[str] = Field(None, description="AI 判断依据")
+    sample_values: Optional[List[Any]] = Field(None, description="样例值")
+    is_skipped: bool = Field(False, description="是否跳过")
+
+
+class FieldMappingCreate(FieldMappingBase):
+    """创建字段映射"""
+    file_id: int = Field(..., description="文件ID")
+
+
+class FieldMappingUpdate(BaseModel):
+    """更新字段映射"""
+    standard_field: Optional[str] = Field(None, description="标准字段名")
+    is_skipped: Optional[bool] = Field(None, description="是否跳过")
+
+
+class FieldMappingResponse(FieldMappingBase):
+    """字段映射响应"""
+    id: int
+    company_id: int
+    file_id: int
+    confirmed: bool
+    confirmed_by: Optional[int] = None
+    confirmed_at: Optional[datetime] = None
+
+    class Config:
+        from_attributes = True
+
+
+class FieldMappingWithFileResponse(FieldMappingResponse):
+    """带文件信息的字段映射响应"""
+    file_type: Optional[str] = None
+    file_name: Optional[str] = None
+
+
+# ===== 批量操作 Schema =====
+
+class ConfirmMappingsRequest(BaseModel):
+    """批量确认映射请求"""
+    mapping_ids: List[int] = Field(..., description="要确认的映射ID列表")
+
+
+class ConfirmMappingsResponse(BaseModel):
+    """批量确认映射响应"""
+    confirmed_count: int = Field(..., description="确认数量")
+    mappings: List[FieldMappingResponse]
+
+
+class SaveAsRuleRequest(BaseModel):
+    """保存为规则请求"""
+    mapping_id: int = Field(..., description="映射ID")
+
+
+class SaveAsRuleResponse(BaseModel):
+    """保存为规则响应"""
+    rule_id: int
+    source_field: str
+    target_field: str
+    message: str
+
+
+# ===== 规则 Schema =====
+
+class CompanyRuleBase(BaseModel):
+    """企业规则基础 schema"""
+    rule_type: str = Field(..., description="规则类型")
+    match_condition: Dict[str, Any] = Field(..., description="匹配条件")
+    target_value: str = Field(..., description="目标值")
+    priority: int = Field(0, description="优先级")
+    description: Optional[str] = Field(None, description="规则描述")
+
+
+class CompanyRuleResponse(CompanyRuleBase):
+    """企业规则响应"""
+    id: int
+    company_id: int
+    status: str
+    match_count: int
+    last_used_at: Optional[datetime] = None
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+class UpdateRuleStatusRequest(BaseModel):
+    """更新规则状态请求"""
+    status: str = Field(..., description="状态 ACTIVE/INACTIVE")
+
+
+class RecognizeFieldsRequest(BaseModel):
+    """识别字段请求"""
+    file_id: int = Field(..., description="文件ID")
+    file_type: str = Field("工资表", description="文件类型")
+
+
+class RecognizeFieldsResponse(BaseModel):
+    """识别字段响应"""
+    file_id: int
+    mappings: List[FieldMappingResponse]
+    high_confidence_count: int = Field(..., description="高置信度数量")
+    medium_confidence_count: int = Field(..., description="中等置信度数量")
+    low_confidence_count: int = Field(..., description="低置信度数量")
+    needs_review: bool = Field(..., description="是否需要人工确认")
+
+
+# ===== 文件映射概览 =====
+
+class FileMappingSummary(BaseModel):
+    """文件映射概览"""
+    file_id: int
+    file_type: str
+    file_name: str
+    total_fields: int
+    confirmed_fields: int
+    high_confidence: int
+    medium_confidence: int
+    low_confidence: int
+    mappings: List[FieldMappingResponse]
+
+
+class TaskMappingOverview(BaseModel):
+    """任务映射概览"""
+    task_id: int
+    total_files: int
+    total_fields: int
+    confirmed_fields: int
+    needs_review: bool
+    files: List[FileMappingSummary]