fix(builder): add explicit return type to _setClause() for isolatedDe…

[Markxuxiao]

Title:
fix(builder): add explicit return type to _setClause() for isolatedDeclarations

Body:

Summary

• Add explicit return type { column: string; value: ExpressionNode }[] to
  SoftDeleteBuilder._setClause() and RestoreBuilder._setClause() in
  src/builder/soft-delete.ts

Root Cause

obuild's transformSync (oxc) fails with TS9017: Only const arrays can be inferred with --isolatedDeclarations when _setClause() returns a shorthand object literal inside an
array without an explicit return type. This causes the file to be silently skipped during the
build, leaving dist/builder/soft-delete.mjs missing.

Fix

-  protected _setClause() {
+  protected _setClause(): { column: string; value: ExpressionNode }[] {
     return [{ column: this._cfg.column, value: deletedValue(this._cfg) }]
   }

Test plan

- pnpm build produces dist/builder/soft-delete.mjs
- dist/index.mjs correctly imports from ./builder/soft-delete.mjs
- No more TS9017 errors for this file

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[Markxuxiao]

我下载最新0.0.13版本使用时报错，提示缺少文件， 我本地打包确实证实少了文件 builder/soft-delete.mjs 按上面修复之后就打包没问题了