feat: adds cursor rules and AGENTS.md to templates (#14889)

Adds dev resources to the base template for a better experience when
building Payload projects with AI tools like Copilot and Cursor.

See more about [AGENTS.md](https://agents.md)

# What's Added

All templates will now ship with an AGENTS.md and .cursor/rules.

1. `AGENTS.md` - https://agents.md
2. `.cursor/rules/` directory

Author: kendelljoseph

docs/plugins/overview.mdx

@@ -49,6 +49,8 @@ Writing Plugins is no more complex than writing regular JavaScript. If you know
 Payload maintains a set of Official Plugins that solve for some of the common use cases. These plugins are maintained by the Payload team and its contributors and are guaranteed to be stable and up-to-date.
 
 - [Form Builder](./form-builder)
+- [MCP](./mcp)
+- [Multi-Tenant](./multi-tenant)
 - [Nested Docs](./nested-docs)
 - [Redirects](./redirects)
 - [Search](./search)