Transaction CRUD endpoints

[azunaVT]

Epic: Budget

Description

Allow manual creation and management of transactions.

Endpoints

• GET /api/v1/transactions
• POST /api/v1/transactions
• PATCH /api/v1/transactions/:id
• DELETE /api/v1/transactions/:id

Acceptance Criteria

• All transactions are scoped to the current household
• Supports basic filtering:
  • date range (from / to)
• Create, update, and delete work as expected
• Cannot access transactions from another household
• Request specs included