feat: 更新分期方案初始化脚本，匹配最新表结构

- 更新表名和字段名为小写格式
- 修正字段类型以匹配实体类定义
- 新增缺失字段：scheme_type, down_payment_ratio等
- 添加索引优化查询性能
- 完善表和字段注释

LCXiaoguan-ui/src/api/system/project/index.ts

@@ -0,0 +1,41 @@
+import type { ProjectVO, ProjectForm } from './types'
+import request from '@/utils/request'
+
+// 项目相关API
+export function listProject(params?: any): Promise<{ rows: ProjectVO[]; total: number }> {
+  return request({
+    url: '/system/project/list',
+    method: 'get',
+    params: params
+  })
+}
+
+export function getProject(id: string | number): Promise<ProjectVO> {
+  return request({
+    url: '/system/project/' + id,
+    method: 'get'
+  })
+}
+
+export function addProject(data: ProjectForm): Promise<any> {
+  return request({
+    url: '/system/project',
+    method: 'post',
+    data: data
+  })
+}
+
+export function updateProject(data: ProjectForm): Promise<any> {
+  return request({
+    url: '/system/project',
+    method: 'put',
+    data: data
+  })
+}
+
+export function delProject(ids: string | number | (string | number)[]): Promise<any> {
+  return request({
+    url: '/system/project/' + ids,
+    method: 'delete'
+  })
+}