Support categories/groups in marketplace.json for plugin organization

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

Problem

As plugin marketplaces grow, the flat plugins array in marketplace.json becomes hard to browse. Our marketplace already has 20+ plugins across different teams and domains (central tooling, regional teams, shared engineering tools), and the only way to create visual grouping is through description prefix conventions like [Central] or [Regional-Product - NorthAm].

Proposed Solution

Support an optional grouping mechanism in marketplace.json, for example:

{
"name": "analytics-hub",
"categories": [
{
"name": "Central",
"description": "Core tooling maintained by the platform team",
"plugins": [...]
},
{
"name": "Regional Product - NorthAm",
"description": "NorthAm regional product analytics plugins",
"plugins": [...]
}
]
}

Or alternatively, a category or tags field on each plugin entry that the /install UI could use to filter or section results.

Alternative Solutions

Current Workarounds

• Square-bracket prefixes in description fields (e.g., [Central], [Engineering Hub])
• Manual ordering of the plugins array to cluster related plugins together

Priority

Medium - Would be very helpful

Feature Category

Other

Use Case Example

Organizations with multiple teams contributing plugins to a shared marketplace need a way for users to quickly find relevant plugins without scrolling through a flat, unsectioned list.

Additional Context

_No response_