fix(rdb): 修复 PostgreSQL int2 类型映射

[zhou-hao]

概述

• 修复 PostgreSQL 方言中 int2 被错误映射为 Byte.class 的问题
• 将 int2 调整为 Short.class
• 补充 PostgresqlArraySupportTest 回归测试，验证 int2 列类型映射结果

背景

在上层 retrieval 的 binding 模式大样本验证中，smallint/int2 标签值如 1000 被写成 -24，导致：

• 标签精准筛选准确率异常
• 向量 + 标签 + 全文混合检索准确率异常

根因定位到 PostgresqlDialect 对 int2 的 Java 类型注册错误。

验证

已本地执行：

mvn -Dsurefire.failIfNoSpecifiedTests=false -Dtest=PostgresqlArraySupportTest -pl hsweb-easy-orm-rdb -am test

结果：

• PostgresqlArraySupportTest: 4 passed

影响

• 修复 PostgreSQL smallint/int2 数值列在 easy-orm 下的类型映射
• 对依赖该映射的上层模块（如 retrieval-pg 的绑定表标签写入/读取）生效

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.22%. Comparing base (68b2764) to head (07b6515).
⚠️ Report is 45 commits behind head on 4.2.

Additional details and impacted files

@@              Coverage Diff              @@
##                4.2     #112       +/-   ##
=============================================
+ Coverage     64.92%   79.22%   +14.29%     
- Complexity     2341     3337      +996     
=============================================
  Files           343      373       +30     
  Lines          9375    10761     +1386     
  Branches        940     1278      +338     
=============================================
+ Hits           6087     8525     +2438     
+ Misses         2810     1616     -1194     
- Partials        478      620      +142     

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