fix: npm publish auth + correct @llmstxt scope

[Muhammad-Hashim]

Description of change

Pull-Request Checklist

• Code is up-to-date with the main branch
• npm run lint passes with this change
• npm run test passes with this change
• This pull request links relevant issues as Fixes #0000
• There are new or updated unit tests validating the change
• Documentation has been updated to reflect this change
• The new commits follow conventions outlined in the conventional commit spec

Summary by CodeRabbit

Release Notes

• Documentation
  • Updated the Next.js package setup guide with clearer examples for configuring route handlers, demonstrating both simplified and full-featured endpoint options.

[coderabbitai]

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Free

Run ID: 53c99e78-589e-41b8-8817-13ce9117599e

📥 Commits

Reviewing files that changed from the base of the PR and between 4906d96 and 78824ef.

📒 Files selected for processing (6)

• .gitignore
• .npmrc.example
• packages/core/package.json
• packages/middleware/package.json
• packages/next/README.md
• packages/next/package.json

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📝 Walkthrough

Walkthrough

This PR adds npm registry authentication configuration, updates the Next.js package setup documentation with a simplified route handler example, and fixes package manifest file closures across three workspace packages.

Changes

Package setup and documentation

Layer / File(s)	Summary
npm authentication configuration and ignore rules .npmrc.example, .gitignore	.npmrc.example now includes a template for npm registry authentication using registry.npmjs.org and an auth token placeholder, while .gitignore is updated to exclude .npmrc files from version control to prevent accidental credential commits.
@llmstxt/next setup documentation packages/next/README.md	The "Setup — zero-config" section is updated to show a new src/app/llms.txt/route.ts example that directly re-exports GET from @llmstxt/next, demonstrating the simplified zero-config approach alongside the existing llms-full.txt handler.
Package.json file closure fixes packages/core/package.json, packages/middleware/package.json, packages/next/package.json	Final closing braces in three workspace package manifests are corrected for consistent file formatting.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A token tucked in .npmrc's name,
Keeps secrets safe from git's wide frame,
Three braces fixed, docs shiny bright,
The packages ready, oh what a sight! 📦✨

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