Remove meeting feature

Drop meetings and meeting_attendees tables, remove all meeting-related
code across GraphQL, MCP, CLI, N8N, webhooks, frontend, and e2e tests.

Signed-off-by: Sacha Al Himdani <sacha@getprobo.com>

packages/n8n-node/nodes/Probo/Probo.node.ts

@@ -116,11 +116,6 @@ export class Probo implements INodeType {
 						value: 'measure',
 						description: 'Manage measures',
 					},
-					{
-						name: 'Meeting',
-						value: 'meeting',
-						description: 'Manage meetings',
-					},
 					{
 						name: 'Organization',
 						value: 'organization',