set up prettier to automatically format typescript code

[thekatze]

Adds prettier to the ./server project to automatically format the typescript code.

This will make CI fail due to the new formatting rules until the codebase is formatted.
Holding off on actually formatting all of the code until #8 is merged to prevent running into formatting merge conflicts.

[Copilot]

Pull Request Overview

This PR adds Prettier configuration to the server project to enforce consistent TypeScript code formatting. The changes integrate Prettier with the existing ESLint setup and provide npm scripts for linting and automatic code formatting.

Key changes include:

• Added Prettier configuration with specific formatting rules (4-space tabs, single quotes, no semicolons)
• Updated package.json scripts to include Prettier checks in the lint process
• Integrated eslint-config-prettier to prevent conflicts between ESLint and Prettier rules

Reviewed Changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 1 comment.

File	Description
server/prettier.config.js	New Prettier configuration file defining formatting rules
server/package.json	Updated lint scripts and added Prettier dependencies
server/eslint.config.js	Added eslint-config-prettier to prevent ESLint/Prettier conflicts
server/.prettierignore	New ignore file excluding Rust code, build artifacts, and dependencies

Files not reviewed (1)

• server/pnpm-lock.yaml: Language not supported