fix(devtools): prevent SSR memory leak in DevTools integration

[PatrikBird]

Add SSR guards to DevTools registration functions to prevent memory leaks in server-side environments by checking both __DEV__ and isClient.

Fixes #4978

🔎 Overview

This PR fixes a memory leak in SSR environments like Nuxt, where the DevTools registration functions were running on the server-side, causing component references to accumulate in memory across requests. I've tested this fix locally and can confirm it successfully eliminates the need for the NODE_ENV=production workaround as described in #4978.

🤓 Code snippets/examples

export function registerFormWithDevTools(form: PrivateFormContext) {
    if (!__DEV__ || !isClient) {
      return; // Exit immediately on server or in production
    }
    // ... rest of function
  }

✔ Issues affected
closes #4978

PS: I'll create another PR #5102 for the v4 Branch. :)

[changeset-bot]

🦋 Changeset detected

Latest commit: 45df338

The changes in this PR will be included in the next version bump.

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[netlify]

✅ Deploy Preview for vee-validate-docs canceled.

Name	Link
🔨 Latest commit	45df338
🔍 Latest deploy log	https://app.netlify.com/projects/vee-validate-docs/deploys/6934156d069ba70008a7f0b8

[netlify]

✅ Deploy Preview for vee-validate-v5 ready!

Name	Link
🔨 Latest commit	45df338
🔍 Latest deploy log	https://app.netlify.com/projects/vee-validate-v5/deploys/6934156d8bf0b100089c1601
😎 Deploy Preview	https://deploy-preview-5101--vee-validate-v5.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[logaretm]

LGTM, thanks!