feat: Add Goals structure to MCP server budget response

[eshaffer321]

Summary

Prepares the MCP server to support goals data in budget queries by adding the necessary data structures.

Changes

• ✅ Add GoalEntry type with fields for goal metadata (ID, name, balances, type, accounts)
• ✅ Add Goals field to GetBudgetOutput response structure
• ✅ Update .gitignore to exclude MCP binary artifacts and test files

Current State

Currently returns nil for goals with a comment explaining that goals require a separate API query. This sets up the infrastructure for future goals support without breaking existing functionality.

Next Steps

The Goals API integration will be completed in a follow-up PR once the correct GraphQL query structure is determined from the Monarch Money API. Initial investigation shows that budgetData.goalsV2 doesn't exist in the API schema - goals likely need to be queried separately.

Testing

• MCP server builds successfully
• MCP server runs and returns budget data (with empty goals array)
• No breaking changes to existing functionality

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 41.80%. Comparing base (70bf1a1) to head (28cc8b3).
⚠️ Report is 1 commits behind head on main.

❌ Your project status has failed because the head coverage (41.80%) is below the target coverage (70.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #13   +/-   ##
=======================================
  Coverage   41.80%   41.80%           
=======================================
  Files          15       15           
  Lines        2239     2239           
=======================================
  Hits          936      936           
  Misses       1236     1236           
  Partials       67       67           

Flag	Coverage Δ
unittests	41.80% <ø> (ø)

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