feat(events): add mana-events service + public RSVP flow (Phase 1b)

New Hono+Bun service at services/mana-events on port 3065 with two
schemas in mana_platform: events_published (snapshots) and public_rsvps
(unauthenticated responses), plus a per-token hourly rate-limit bucket.

- Host endpoints (JWT) for publish/update/unpublish/list-rsvps
- Public endpoints for snapshot fetch + RSVP upsert with rate limiting
- New /rsvp/[token] page outside the auth gate, SSR-loads the snapshot
- Client store wires publishEvent/unpublishEvent to the server, syncs
  snapshot updates after edits, and deletes the snapshot on event delete
- DetailView polls GET /events/:id/rsvps every 30s while open and lets
  hosts import a public response into their local guest list
- generate-env, setup-databases.sh, .env.development, hooks.server.ts,
  package.json wired for local dev

services/mana-events/src/middleware/error-handler.ts

@@ -0,0 +1,10 @@
+import type { ErrorHandler } from 'hono';
+import { HTTPException } from 'hono/http-exception';
+
+export const errorHandler: ErrorHandler = (err, c) => {
+	if (err instanceof HTTPException) {
+		return c.json({ statusCode: err.status, message: err.message }, err.status);
+	}
+	console.error('Unhandled error:', err);
+	return c.json({ statusCode: 500, message: 'Internal server error' }, 500);
+};