Add optional Icon property to Goal model

[vamsi-trashgamingyt]

This pull request updates the CommBank backend to support an optional Icon field on goals so the frontend can display goal icons.

Changes made:

Added a nullable Icon property to the Goal model so existing data stays compatible.

Updated configuration and secrets to point to the correct MongoDB Atlas cluster.

Adjusted goal controller tests to cover the new Icon field where applicable.

Testing:

Ran the API locally with dotnet run.

Used Postman to call the goals endpoint and confirmed responses still return correctly, including the icon field when present.

[gitguardian]

⚠️ GitGuardian has uncovered 1 secret following the scan of your pull request.

Please consider investigating the findings and remediating the incidents. Failure to do so may lead to compromising the associated services or software components.

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🔎 Detected hardcoded secret in your pull request

GitGuardian id	GitGuardian status	Secret	Commit	Filename
-	-	MongoDB Credentials	42c2e78	CommBank-Server/Secrets.json	View secret

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• following these best practices for managing and storing secrets including API keys and other credentials
• install secret detection on pre-commit to catch secret before it leaves your machine and ease remediation.

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