fix: declare err variable inline for startDirWatcher call

[johnlanni]

Problem

After PR #236 was merged, compilation fails with:

pkg/registry/file_rest.go:81:2: undefined: err
pkg/registry/file_rest.go:82:5: undefined: err
pkg/registry/file_rest.go:83:15: undefined: err

Root Cause

PR #236 removed the watcher, err := fsnotify.NewWatcher() lines but the code still references the err variable on the next lines.

Solution

Change:

err = f.startDirWatcher()
if err != nil {
    return nil, err
}

To:

if err := f.startDirWatcher(); err != nil {
    return nil, err
}

This declares err inline, fixing the undefined variable error.

Testing

Compilation now succeeds.

[lingma-agents]

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🔄 分支流向: fix/file-rest-err-variable ➜ main

📦 提交: 审查当前PR从7948cb4到c56a642的提交。

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📒 文件清单 （1 个文件）

📝 变更: 1 个文件

📝 变更文件:

• src/apiserver/pkg/registry/file_rest.go

[lingma-agents]

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