feat(mcp): add agent webhook management tools (PRO-1950)

[prat11m]

Summary

• Adds 5 MCP tools (1:1 with backend /webhook routes) to manage agent webhooks / event subscriptions — attaching start-call / end-call / post-call-analytics deliveries to agents, which was previously only possible via the dashboard or the main-backend API directly.
• Event types map to: pre-conversation (call start), post-conversation (call end), analytics-completed (post-call analytics).
• New file src/tools/webhooks.ts; registered in src/tools/index.ts.

Tool	Route
create_webhook	POST /webhook
get_webhooks	GET /webhook[?webhookId=]
update_webhook	PATCH /webhook/:id
delete_webhook	DELETE /webhook/:id
get_webhook_events	GET /webhook/events?webhookId=

Notes / limitations

• Backend only writes subscriptions at create time; PATCH /webhook/:id updates URL/description/headers but not WebhookSubscription. So update_webhook cannot re-attach agents/events — callers must delete + recreate. Documented in the tool description.
• mcp-server is standalone (no @repo/atoms-types), so the event-type enum is defined locally.
• Auth reuses the existing Bearer API key — webhook routes share the same verifyToken → verifyOrganization → verifyMemberRole chain as /agent.

Test plan

• create_webhook with an agent_id + all 3 event types → returns webhook id; verify subscriptions in dashboard.
• get_webhooks (list + by id) shows populated agent/event subscriptions.
• update_webhook changes URL/description/headers.
• get_webhook_events returns delivery logs after a test call.
• delete_webhook removes it and detaches from the agent.

Linear

PRO-1950

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