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/db/migrations/001-initial.ts

@@ -61,6 +61,8 @@ export const migration001: Migration = {
         platform_id    TEXT,
         channel_type   TEXT,
         thread_id      TEXT,
+        title          TEXT NOT NULL,
+        options_json   TEXT NOT NULL,
         created_at     TEXT NOT NULL
       );
     `);