feat(v2/approvals): per-card titles and structured options

Approval cards now carry a required title (Add MCP Request, Install
Packages Request, Rebuild Request, Credentials Request) and structured
options with distinct pre-click label, post-click selectedLabel (e.g.
"✅ Approved" / "❌ Rejected"), and value used for click routing. The
title and normalized options are persisted in pending_questions so the
post-click card edit can render the correct per-type title and selected
label on both chat-sdk channels and Discord interactions.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/types.ts

@@ -86,6 +86,8 @@ export interface PendingQuestion {
   platform_id: string | null;
   channel_type: string | null;
   thread_id: string | null;
+  title: string;
+  options: import('./channels/ask-question.js').NormalizedOption[];
   created_at: string;
 }