Support icons

[Pratik0066]

Summary

Added Icon property to the Goal model and implemented the GetForUser controller test.

Changes

• Goal.cs — Added Icon property to support goal icons
• GoalControllerTests.cs — Added GetForUser test verifying result is not null, each item is assignable from Goal, and each has the expected UserId
• CommBank.csproj / CommBank.Tests.csproj — Updated target framework to net10.0
• launchSettings.json — Fixed application URLs to use HTTPS
• appsettings.json — Added HTTP → HTTPS redirection config

[gitguardian]

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