refactor(project):重构项目结构并迁移至snails-chat模块- 将项目主模块更名为snails-chat，调整包结构

- 移除JPA相关依赖，替换为MyBatis-Plus- 数据库从MySQL迁移至PostgreSQL- 移除QueryTool工具类及相关依赖- 更新Redis配置，使用JSON序列化- 移除DashScopeController及AIResponse类
- 添加User实体类及Mapper接口
- 调整ChatClientConfiguration配置类- 更新pom.xml依赖管理及模块配置

snails-chat/pom.xml

@@ -0,0 +1,28 @@
+<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">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>com.hanserwei</groupId>
+        <artifactId>snails-ai</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+    </parent>
+
+    <groupId>com.hanserwei.chat</groupId>
+    <artifactId>snails-chat</artifactId>
+    <packaging>jar</packaging>
+
+    <name>snails-chat</name>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>3.8.1</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+</project>