style: Update code formatting for consistency and readability & fixed…

[n3rdc4ptn]

… fastify routes

What this PR does / why we need it:

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

[Copilot]

Pull Request Overview

This PR standardizes code formatting and improves consistency across Fastify routes and plugins.

• Switched all string delimiters from double to single quotes.
• Added explicit return statements in route handlers and the onSend hook to ensure payloads are correctly returned.
• Updated .prettierrc to increase printWidth to 120 for broader line lengths.

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
server/routes/root.js	Unified quotes and added return for the root health check
server/routes/feedback.js	Unified quotes and removed trailing comma in response object
server/routes/auth-onboarding.js	Unified quotes, added return in callbacks, formatted handlers
server/routes/auth-mcp.js	Unified quotes, added return in callbacks, formatted handlers
server/plugins/sensible.js	Unified quotes
server/plugins/http-proxy.js	Unified quotes, formatted preHandler, added return in hooks
server/plugins/auth-utils.js	Unified quotes and formatted utility decorators
server/encrypted-session.js	Unified quotes, formatted hooks, added return payload in onSend
server/app.js	Unified quotes, formatted autoload paths
.prettierrc	Increased printWidth from 80 to 120