Fix: Remove remaining /api prefixes from routes

[tomast1337]

This pull request revises the removal of the /api prefix from backend routes. It was found that some locations were still using the old /api/v1 path.

This change updates all remaining instances to use the correct /v1 prefix, ensuring consistency across the application.

[Copilot]

Pull Request Overview

This pull request completes the removal of /api prefixes from backend routes by updating remaining instances that were still using the old /api/v1 path to use the new /v1 prefix.

• Updates environment configuration files to use the new API URL format
• Modifies authentication strategy callback URLs to remove /api prefix
• Updates backend service fetch URLs and test cases
• Corrects documentation examples to reflect the new route structure

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
apps/frontend/.env.local.example	Updates API URL environment variable to use /v1 instead of /api/v1
apps/backend/src/song/song-upload/song-upload.service.ts	Updates fetch URLs for sound list data endpoints
apps/backend/src/auth/strategies/magicLinkEmail.strategy.ts	Updates magic link callback and confirm URLs
apps/backend/src/auth/strategies/magicLinkEmail.strategy.spec.ts	Updates test cases with new magic link callback URLs
apps/backend/src/auth/strategies/google.strategy.ts	Updates Google OAuth callback URL
apps/backend/src/auth/strategies/github.strategy.ts	Updates GitHub OAuth callback URL
apps/backend/src/auth/strategies/discord.strategy/index.ts	Updates Discord OAuth callback URL
CONTRIBUTING.md	Updates documentation examples with new API URL format

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[Bentroen]

Thank you for reviewing the missing places! I'll be merging the PR now.