fix(javascript): preserve getTypeInfo in regenerated read serializer

[xhzq233]

Why?

TypeResolver.regenerateReadSerializer() returned a partial serializer object that missed getTypeInfo.

When runtime paths later call original.getTypeInfo() (for example in ReadContext type-meta regeneration flow), it can throw:

TypeError: original.getTypeInfo is not a function

What does this PR do?

• Add getTypeInfo: serializer.getTypeInfo when registering the regenerated serializer in javascript/packages/core/lib/typeResolver.ts.
• Keep regenerated serializer interface consistent with normal serializer instances.

Minimal reproduction:

const core = require("./javascript/packages/core/dist/index.js");
const Fory = core.default;
const { Type } = core;

const fory = new Fory({ compatible: true });
const serializer = fory.typeResolver.regenerateReadSerializer(
  Type.struct({ namespace: "demo", typeName: "repro_struct" }, {
    id: Type.int32(),
  }),
);

console.log(typeof serializer.getTypeInfo); // before: undefined, after: function
serializer.getTypeInfo();

Related issues

Fixes #3668

AI Contribution Checklist

• Substantial AI assistance was used in this PR: no
• If yes, I included a completed AI Contribution Checklist in this PR description and the required AI Usage Disclosure.
• If yes, my PR description includes the required ai_review summary and screenshot evidence of the final clean AI review results from both fresh reviewers on the current PR diff or current HEAD after the latest code changes.

Does this PR introduce any user-facing change?

• Does this PR introduce any public API change?
• Does this PR introduce any binary protocol compatibility change?

Benchmark

N/A (bug fix, no protocol/perf-path behavior change expected).

[chaokunyang]

@xhzq233 Thanks for fix this. Could you add a test to cover it?

[xhzq233]

@chaokunyang Thanks for the review. I have added a regression test in javascript/test/typemeta.test.ts:

• test name: regenerated read serializers keep getTypeInfo
• assertion: regenerateReadSerializer(...) returns a serializer with getTypeInfo available for named structs

Local verification command:

npm --prefix javascript run test -- typemeta.test.ts

And I also verified fail/pass behavior:

• on upstream main without this fix: this test fails (Expected function, Received undefined)
• on this PR branch with fix: this test passes