Integrate Prettier into project configuration

- Added `eslint-config-prettier` to disable conflicting ESLint rules.
- Configured Prettier with `.prettierrc` for consistent formatting.
- Updated `package.json` scripts to apply and check formatting on entire project.
- Added `.prettierignore` to exclude unnecessary files and directories from formatting.
- Updated dependencies in `package-lock.json` and removed unused packages.

frontend/eslint.config.mjs

@@ -12,6 +12,7 @@ const compat = new FlatCompat({
 const eslintConfig = [
   ...compat.extends('next/core-web-vitals'),
   ...compat.extends('next/typescript'),
+  ...compat.extends('prettier'), // Disable ESLint rules that conflict with Prettier
   {
     ignores: [
       'node_modules/**',