Feat/bulk updates

[RadCod3]

Closes #6

[Copilot]

Pull Request Overview

This PR implements bulk transaction operations by adding functionality to create and update multiple transactions in a single operation. It replaces the specific budget-focused transaction update functionality with more general transaction update capabilities.

• Adds bulk create and update operations for transactions
• Replaces budget-specific transaction updates with general transaction updates
• Updates test coverage for new bulk operations

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/unit/test_server.py	Adds tests for bulk create/update operations and replaces budget-specific update tests
tests/unit/test_models.py	Removes tests for the deprecated UpdateTransactionBudgetRequest model
tests/unit/test_firefly_client.py	Adds comprehensive tests for new bulk operations in the client layer
src/lampyrid/server.py	Implements new MCP tools for bulk operations and general transaction updates
src/lampyrid/models/lampyrid_models.py	Adds new request models for bulk operations and general transaction updates
src/lampyrid/clients/firefly.py	Implements client methods for bulk create/update using individual API calls

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