fix: exclude vector arrays from CLI --json output

[dingguagua996-stack]

Summary

The --json output for list, search, and stats CLI commands included full vector arrays (768-1024 dimensional floats per entry), making output extremely verbose and unreadable.

Changes

Use a JSON replacer function in formatJson() to automatically filter out vector fields from all CLI JSON output. This is consistent with the export command which already strips vectors (line 888: vector: undefined).

Before

{
  "id": "abc123",
  "text": "Some memory",
  "vector": [0.023, -0.045, 0.012, ...],  // 768+ numbers!
  ...
}

After

{
  "id": "abc123",
  "text": "Some memory",
  ...
}

Files Changed

File	Change
cli.ts	formatJson() now uses JSON replacer to exclude vector key

Fixes #302

[AliceLJY]

方向对，CLI --json 去掉 vector 数组确实是刚需。

麻烦 rebase 到最新 master（我们刚发了 beta.10），然后补一个 test/cli-smoke.mjs 的断言：search 和 list 的 --json 输出里不包含 "vector" 字段。

rebase + 补测试后可以合 👍