docs: update Node.js requirements and security reporting

[mahid797]

Summary

• fix GitHub link casing and drop placeholder docs/support links
• require Node.js 20+ and note engines field
• route security and conduct reports through GitHub Security Advisories

Testing

• npm run lint
• npm run check

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https://chatgpt.com/codex/tasks/task_e_68a405356cd4832d9ec12f157e1157f2

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[Copilot]

Pull Request Overview

Updates documentation to clarify Node.js requirements, correct GitHub repository casing, and establish security reporting channels through GitHub's built-in features.

• Standardized Node.js 20+ requirement across documentation and package.json engines field
• Fixed GitHub repository URL casing from "langRoute" to "LangRoute"
• Replaced placeholder email addresses with GitHub Security Advisories for security and conduct reporting

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/app/(client)/page.tsx	Fixed GitHub link casing and replaced placeholder docs/support links with TODO placeholders
package.json	Added engines field requiring Node.js 20+
docs/getting-started.md	Updated Node.js requirement from 18.18+ to 20+
SECURITY.md	Replaced placeholder email with GitHub Security Advisories link
README.md	Removed "(recommended)" qualifier from Node.js 20+ requirement
CODE_OF_CONDUCT.md	Added GitHub Security Advisories reporting option and issue-based reporting

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[Copilot]

TODO placeholders are displayed to end users in the footer. Consider either removing these spans entirely or using CSS to hide them from production builds until the actual links are available.

Suggested change

	<span className='text-muted-foreground'>
	[TODO: Insert external docs site link when available]
	</span>
	<span className='text-muted-foreground'>
	[TODO: Insert support contact when available]
	</span>