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/src/main/resources/config/application.yml

@@ -0,0 +1,66 @@
+#file: noinspection SpringBootConfigYamlInspection
+server:
+  servlet:
+    encoding:
+      charset: utf-8
+      force: true
+spring:
+  application:
+    name: snails-ai
+  banner:
+    location: config/banner.txt
+  data:
+    redis:
+      host: localhost
+      port: 6379
+      password: redis
+      database: 4
+      lettuce:
+        pool:
+          enabled: true
+          max-active: 20
+          max-idle: 10
+          max-wait: 10000
+          min-idle: 10
+          time-between-eviction-runs: 10000
+  datasource:
+    driver-class-name: org.postgresql.Driver
+    url: jdbc:postgresql://localhost:5432/postgres
+    username: postgres
+    password: postgressql
+    # HikariCP 连接池配置
+    hikari:
+      maximum-pool-size: 20       # 最大连接数设置为 20
+      minimum-idle: 20            # 保持 20 个空闲连接（与最大连接数一致）
+      connection-timeout: 5000    # 获取连接超时 5 秒
+      max-lifetime: 28800000      # 8 小时（确保在数据库连接超时前被回收）
+  ai:
+    memory:
+      redis:
+        host: localhost
+        port: 6379
+        timeout: 5000
+        password: redis
+    dashscope:
+      api-key: ENC(cMgcKZkFllyE88DIbGwLKot9Vg02co+gsmY8L8o4/o3UjhcmqO4lJzFU35Sx0n+qFG8pDL0wBjoWrT8X6BuRw9vNlQhY1LgRWHaF9S1zzyM=)
+      chat:
+        options:
+          model: qwen-plus
+          temperature: 0.5
+mybatis-plus:
+  configuration:
+    map-underscore-to-camel-case: true
+    log-impl: org.apache.ibatis.logging.slf4j.Slf4jImpl
+  global-config:
+    banner: false
+  mapper-locations: classpath*:/mapperxml/*.xml
+logging:
+  level:
+    # 隐藏掉 Hibernate 冗长的连接池 INFO 信息
+    org.hibernate.orm.connections.pooling: WARN
+    org.springframework.ai.chat.client.advisor: DEBUG
+jasypt:
+  encryptor:
+    password: ${jasypt.encryptor.password}
+    algorithm: PBEWithHMACSHA512AndAES_256
+    iv-generator-classname: org.jasypt.iv.RandomIvGenerator