feat: organizer-side "Republish mine" button + scoped endpoint

The admin /republish-all hits every approved event regardless of
owner — useful for the catalog migration, but heavy. Organizers
who want to re-emit just THEIR own events (e.g. after the AIO
publisher gained the tickets_* tags and an organizer's events
should pick them up) need a lighter knob.

Backend: new POST /republish-mine wallet-scoped via require_admin_key,
mirrors api_tickets's `all_wallets=true` shape so the page can
re-emit across every wallet the user owns. Filters to approved +
non-canceled rows.

UI: "Republish mine" button alongside "New Event" so every
logged-in user sees it (no isAdmin gate). Loading state +
confirm dialog + success count notification.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

static/js/index.vue

@@ -42,9 +42,23 @@
 
       <q-card>
         <q-card-section>
-          <q-btn unelevated color="primary" @click="openEventDialog"
-            >New Event</q-btn
-          >
+          <div class="row items-center q-gutter-sm">
+            <q-btn unelevated color="primary" @click="openEventDialog"
+              >New Event</q-btn
+            >
+            <q-btn
+              outline
+              color="primary"
+              icon="cloud_upload"
+              label="Republish mine"
+              :loading="republishingMine"
+              @click="republishMyEvents"
+            ></q-btn>
+          </div>
+          <div class="text-caption q-mt-sm" style="color: #aaa">
+            Re-emit your approved events to Nostr relays. Useful after
+            a publisher upgrade or if a relay dropped your events.
+          </div>
         </q-card-section>
       </q-card>