feat: auth

[ivanskv2000]

📌 Authentication and OAUTH2

✨ What’s Changed?

• Added basic auth with email and password
• Added OAUTH2 w. support for Google and Github providers
• Added a separate auth store on frontend
• Closed backend endpoints behind auth
• Protected frontend routes behind auth

📂 Scope

• frontend
• backend
• common/shared
• CI/config

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
2 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarQube Cloud