Add goal icon support with emoji picker

[abhi9ab]

Summary

Added support for goal icons in backend and extended API functionality.

Changes

• Added optional Icon field to Goal model
• Updated Goal API to support icon updates via PUT
• Ensured icon field is included in responses
• Added test coverage for GetGoalsForUser endpoint

Result

• Backend now supports storing and retrieving goal icons
• Icon updates persist correctly in database
• API responses include icon field

Notes

• Backward compatible (icon is optional)
• Existing functionality unchanged

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