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-common/ruoyi-common-idempotent/pom.xml

@@ -0,0 +1,41 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <groupId>org.dromara</groupId>
+        <artifactId>ruoyi-common</artifactId>
+        <version>${revision}</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>ruoyi-common-idempotent</artifactId>
+
+    <description>
+        ruoyi-common-idempotent 幂等功能
+    </description>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.dromara</groupId>
+            <artifactId>ruoyi-common-json</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.dromara</groupId>
+            <artifactId>ruoyi-common-redis</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>cn.hutool</groupId>
+            <artifactId>hutool-crypto</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>cn.dev33</groupId>
+            <artifactId>sa-token-core</artifactId>
+        </dependency>
+
+    </dependencies>
+
+</project>