Add insight tools

[RadCod3]

The Firefly III API has 24 insight endpoints organized in three categories:

1. Expense Insights (/v1/insight/expense/*)

Endpoint	Description	Response Type
/expense/expense	Expenses grouped by expense account	InsightGroup
/expense/asset	Expenses grouped by asset account	InsightGroup
/expense/bill	Expenses grouped by bill	InsightGroup
/expense/no-bill	Expenses without bills	InsightTotal
/expense/budget	Expenses grouped by budget	InsightGroup
/expense/no-budget	Expenses without budget	InsightTotal
/expense/category	Expenses grouped by category	InsightGroup
/expense/no-category	Expenses without category	InsightTotal
/expense/tag	Expenses grouped by tag	InsightGroup
/expense/no-tag	Expenses without tags	InsightTotal
/expense/total	Total expenses	InsightTotal

2. Income Insights (/v1/insight/income/*)

Endpoint	Description	Response Type
/income/revenue	Income grouped by revenue account	InsightGroup
/income/asset	Income grouped by asset account	InsightGroup
/income/category	Income grouped by category	InsightGroup
/income/no-category	Income without category	InsightTotal
/income/tag	Income grouped by tag	InsightGroup
/income/no-tag	Income without tags	InsightTotal
/income/total	Total income	InsightTotal

3. Transfer Insights (/v1/insight/transfer/*)

Endpoint	Description	Response Type
/transfer/asset	Transfers grouped by account	InsightTransfer
/transfer/category	Transfers grouped by category	InsightGroup
/transfer/no-category	Transfers without category	InsightTotal
/transfer/tag	Transfers grouped by tag	InsightGroup
/transfer/no-tag	Transfers without tags	InsightTotal
/transfer/total	Total transfers	InsightTotal

We can support a subset of these endpoints by adding MCP tools for insights.