Allow authenticated members to bypass coming-soon page

Add JWT-verified session check to coming-soon middleware so logged-in
members can access the full site. Add member login link and modal to
the coming-soon page so members can sign in before launch.

app/pages/coming-soon.vue

@@ -1,9 +1,16 @@
 <template>
-  <div class="min-h-screen w-full flex items-center justify-center">
+  <div class="min-h-screen w-full flex flex-col items-center justify-center">
     <a href="https://babyghosts.fund/ghost-guild" class="text-center">
       <h1 class="text-5xl md:text-6xl font-bold mb-4">Ghost Guild</h1>
       <p class="text-xl md:text-2xl">Coming Soon</p>
     </a>
+    <button
+      class="mt-12 text-sm text-guild-500 hover:text-guild-300 transition-colors"
+      @click="openLoginModal"
+    >
+      Member login
+    </button>
+    <LoginModal />
   </div>
 </template>
 
@@ -11,4 +18,6 @@
 definePageMeta({
   layout: "coming-soon",
 });
+
+const { openLoginModal } = useLoginModal();
 </script>