fix(plugin-oracle): make channel-fatal classification testable to unbreak test target

[desperadoxhy]

问题

main HEAD 的 TableProTests/Plugins/OracleConnectionErrorTests.swift(PR #1723 引入)引用 OracleConnectionWrapper.isChannelFatalCode,但 OracleConnectionWrapper 是 OracleDriverPlugin 的 plugin 内部类型,app/test target 通过 @testable import TablePro 看不到它,导致整个 TableProTests target 编译失败(exit 65),macOS App Tests 全部无法运行,并阻塞其他 PR 的 CI。

修复

把 isChannelFatalCode 的纯字符串分类逻辑提到 TableProPluginKit 的 public OracleChannelFatalCode(TableProPluginKit 已有 PluginDriverError / SSLHandshakeError / AWSAuthError 等 driver 特定 error 类型作为先例)。OracleConnectionWrapper 转调,行为不变。测试改为 import TableProPluginKit 测可见类型。

PluginKit 改动为新增一个 public enum,纯 additive,无 ABI bump,无需 version bump。

验证

• App target BUILD SUCCEEDED
• TableProTests target 编译通过(cannot find 'OracleConnectionWrapper' 消除)
• OracleConnectionErrorTests 6 断言全绿
• PluginKit diff 纯 additive(新增 public enum,无现有 public symbol 改动)

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[desperadoxhy]

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