chore(webrtc-example): update deps and tsconfig for Next 16

[Nisarg48]

Summary

• Modernize tsconfig.json (target ES2017, moduleResolution bundler) for Next.js 16 / TypeScript 6+
• Update package.json dependencies and npm overrides for known transitive vulnerabilities

Test plan

• npm run build
• npm run start (smoke test at http://localhost:3000)
• npm run test-all

[Copilot]

Pull request overview

Routine dependency maintenance for the WebRTC example app, modernizing TypeScript configuration to align with Next.js 16/TypeScript 6+, bumping Next.js to 16.2.5, and adding overrides for known transitive vulnerabilities (axios, follow-redirects, postcss). README also gets minor markdown formatting cleanup.

Changes:

• Update tsconfig.json to target: es2017 and moduleResolution: bundler.
• Bump next to ^16.2.5 and add axios, follow-redirects, postcss to npm overrides.
• Reformat README spacing/list indentation (no functional content changes).

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
examples/webrtc-client-example/tsconfig.json	Modernize TS compiler target and module resolution for Next 16.
examples/webrtc-client-example/package.json	Bump Next.js and add overrides for vulnerable transitive deps.
examples/webrtc-client-example/package-lock.json	Regenerated lockfile reflecting dependency bumps and overrides.
examples/webrtc-client-example/README.md	Markdown formatting/spacing cleanup.

Files not reviewed (1)

• examples/webrtc-client-example/package-lock.json: Language not supported

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