feat: 首付分期功能实现 - 项目初始化提交

- 添加首付分期功能相关表结构和数据
- 实现首付分期策略管理
- 添加首付分期支付详情管理
- 完善项目相关功能模块
- 修复外键类型问题
- 添加相关初始化脚本和文档

ruoyi-ui/src/assets/icons/svg/gitee.svg

@@ -0,0 +1 @@
+<?xml version="1.0" standalone="no"?><!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"><svg t="1686919908144" class="icon" viewBox="0 0 1024 1024" version="1.1" xmlns="http://www.w3.org/2000/svg" p-id="2521" width="200" height="200" xmlns:xlink="http://www.w3.org/1999/xlink"><path d="M512 992C246.895625 992 32 777.104375 32 512S246.895625 32 512 32s480 214.895625 480 480-214.895625 480-480 480z m242.9521875-533.3278125h-272.56875a23.7121875 23.7121875 0 0 0-23.71125 23.7121875l-0.024375 59.255625c0 13.08 10.6078125 23.7121875 23.6878125 23.7121875h165.96c13.104375 0 23.7121875 10.6078125 23.7121875 23.6878125v11.855625a71.1121875 71.1121875 0 0 1-71.1121875 71.1121875h-225.215625a23.7121875 23.7121875 0 0 1-23.6878125-23.7121875V423.1278125a71.1121875 71.1121875 0 0 1 71.0878125-71.1121875h331.824375a23.7121875 23.7121875 0 0 0 23.6878125-23.71125l0.0721875-59.2565625a23.7121875 23.7121875 0 0 0-23.68875-23.7121875H423.08a177.76875 177.76875 0 0 0-177.76875 177.7921875V754.953125c0 13.1034375 10.60875 23.7121875 23.713125 23.7121875h349.63125a159.984375 159.984375 0 0 0 159.984375-159.984375V482.36a23.7121875 23.7121875 0 0 0-23.7121875-23.6878125z" fill="#515151" p-id="2522"></path></svg>