Fix: Added H2 database dependency and local config to fix startup crash

[MayukhPal]

---

📌 Description

The login-service was failing to start locally because it was missing a database configuration. I added the H2 runtime dependency and a default application.properties to allow the service to run out-of-the-box

---

🔗 Related Issue

Fixes local startup crash

---

🛠️ Type of Change

Please mark the relevant option:

• Documentation update
• Bug fix
• New feature
• Refactor
• Configuration / DevOps change
• Other (please explain)

---

🧪 How Was This Tested?

Describe how you verified your changes:

• Docker Compose runs successfully
• Frontend loads correctly
• Service builds without errors
• Documentation renders correctly
• Manual testing

---

📸 Screenshots (if applicable)

✅ Checklist

Please confirm the following:

• My code follows the project structure
• I tested my changes locally
• I linked the relevant issue
• I kept this PR focused and minimal
• I am open to feedback and changes

[github-actions]

🚫 Pull Request Policy Violation

Hi @MayukhPal, thanks for your contribution!

Direct PRs to the master branch are not allowed. Please close this PR and target the stage branch instead for review.