feat(calendar): add event_guests migration 096

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

database/migrations/096_event_guests.sql

@@ -0,0 +1,18 @@
+-- Migration 096: Event Guests
+-- Allows users to register accompanying guests for events
+
+CREATE TABLE IF NOT EXISTS event_guests (
+    id SERIAL PRIMARY KEY,
+    event_id INTEGER NOT NULL REFERENCES norda_events(id) ON DELETE CASCADE,
+    host_user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    first_name VARCHAR(100),
+    last_name VARCHAR(100),
+    organization VARCHAR(255),
+    created_at TIMESTAMP NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX IF NOT EXISTS ix_event_guests_event_id ON event_guests(event_id);
+CREATE INDEX IF NOT EXISTS ix_event_guests_host_user_id ON event_guests(host_user_id);
+
+GRANT ALL ON TABLE event_guests TO nordabiz_app;
+GRANT USAGE, SELECT ON SEQUENCE event_guests_id_seq TO nordabiz_app;