[zoho] Add Zoho CRM, Zoho Desk, and Zoho Books plugins

[liam-ilan]

Add Zoho CRM, Zoho Desk, and Zoho Books plugins

The backend already has Merge connectors for Zoho CRM, Zoho Desk, and Zoho Books, and the mobile app lists them as Merge plugins, but the marketplace has no plugins that turn them on.

Changes

• Add zoho-crm, zoho-desk, and zoho-books plugins in third_party/. They follow the quickbooks-online pattern: no mcp.json and no variables, because Cursor hosts the server and runs the Zoho sign-in.
• Each plugin name matches marketplacePluginName in backend/server/src/mcp/merge/connectors.ts.
• Add Zoho's official product marks as logos, plus a README, a CHANGELOG, and a LICENSE for each plugin.
• List the plugins in .cursor-plugin/marketplace.json and the main README table, after WhatsApp Business.

Notes

• The READMEs describe the data center picker, the regions each connector supports, and what the sign-in scopes allow. All three can create, update, and delete records.
• minClientVersions.cursor is 3.19.0, the same as QuickBooks Online and WhatsApp Business.
• node scripts/validate-plugins.mjs passes.
• Not yet tested: installing and signing in to each plugin, and whether the Zoho connectors are live in production.

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Note

Low Risk
Changes are marketplace manifests and docs only; risk is mainly that users who install get agent tools that can mutate Zoho CRM, support, and accounting data after OAuth.

Overview
Adds three new Cursor marketplace integrations—zoho-crm, zoho-desk, and zoho-books—so users can install and turn on the existing Cursor-hosted Zoho MCP connectors from the plugin catalog.

Each plugin is a third_party/ package with manifest, README, CHANGELOG, and LICENSE, following the QuickBooks Online model: no local mcp.json; installing is the opt-in, with Cursor-managed Zoho OAuth and a data-center picker before sign-in. READMEs document supported regions and that agents can read and create, update, or delete records in CRM, Desk, and Books.

marketplace.json and the root README plugin table list all three entries (placed after WhatsApp Business).

^{Reviewed by Cursor Bugbot for commit 87635c8. Bugbot is set up for automated code reviews on this repo. Configure here.}