Zoho Books connector: missing Projects/Timesheets endpoints

### Problem Statement

The Zoho Books MCP connector (directory UUID 9e4a3416-f5b4-4a89-8e3a-a4955fa17475) exposes invoices, expenses, estimates, contacts, sales/purchase orders, items, and custom modules, but has no tools for the Projects/Timesheets module of Zoho Books.

### Proposed Solution

Zoho Books natively supports Projects and Timesheets (create/list projects, log time entries, pull time summaries by project), and the underlying Zoho Books API supports these objects. The current MCP tool set doesn't include them, so there's no way to ask Claude to "summarize timesheets for Project X" or "log a new timesheet entry" even though the connector is otherwise fully connected and working for financial data.

Request: add tools for the Projects/Timesheets module, e.g.:

list_projects / get_project
list_timesheets (filterable by project, user, date range)
create_timesheet_entry
update_timesheet_entry / delete_timesheet_entry

This would let users manage project time tracking directly through Claude, alongside the existing invoicing/expense workflows.

### Alternatives Considered

_No response_

### Area

Other

### Priority

Medium - Would be helpful

### Additional Context

Reference: Zoho Books Projects & Timesheets API docs: https://www.zoho.com/books/api/v3/projects-and-timesheet/